diff --git a/.eslintignore b/.eslintignore
index c671566a14978..0622612311021 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -81,4 +81,4 @@ theme/boost/scss/fontawesome/
 theme/bootstrapbase/less/bootstrap/
 theme/bootstrapbase/javascript/html5shiv.js
 theme/bootstrapbase/amd/src/bootstrap.js
-theme/bootstrapbase/less/fontawesome/
+theme/bootstrapbase/less/fontawesome/
\ No newline at end of file
diff --git a/.stylelintignore b/.stylelintignore
index d8ad8e62b85b2..cfcf7025b0d9f 100644
--- a/.stylelintignore
+++ b/.stylelintignore
@@ -82,4 +82,4 @@ theme/boost/scss/fontawesome/
 theme/bootstrapbase/less/bootstrap/
 theme/bootstrapbase/javascript/html5shiv.js
 theme/bootstrapbase/amd/src/bootstrap.js
-theme/bootstrapbase/less/fontawesome/
+theme/bootstrapbase/less/fontawesome/
\ No newline at end of file
diff --git a/admin/tool/models/amd/src/log_info.js b/admin/tool/models/amd/src/log_info.js
index 5af6d6aaa4bfb..6f9a114734be6 100644
--- a/admin/tool/models/amd/src/log_info.js
+++ b/admin/tool/models/amd/src/log_info.js
@@ -13,11 +13,12 @@ define(['jquery', 'core/str', 'core/modal_factory', 'core/notification'], functi
 
         /**
          * Prepares a modal info for a log's results.
+         *
          * @access public
          * @param {int} id
-         * @return {String} HTML info
+         * @param {string[]} info
          */
-        loadInfo : function(id, info) {
+        loadInfo: function(id, info) {
 
             var link = $('[data-model-log-id="' + id + '"]');
             str.get_string('loginfo', 'tool_models').then(function(langString) {
diff --git a/admin/tool/models/classes/analytics/target/course_dropout.php b/admin/tool/models/classes/analytics/target/course_dropout.php
index 1f6554f224edf..6ce111b1ef96d 100644
--- a/admin/tool/models/classes/analytics/target/course_dropout.php
+++ b/admin/tool/models/classes/analytics/target/course_dropout.php
@@ -40,12 +40,22 @@
  */
 class course_dropout extends \core_analytics\local\target\binary {
 
-    protected $coursegradeitem = null;
-
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('target:coursedropout', 'tool_models');
     }
 
+    /**
+     * prediction_actions
+     *
+     * @param \core_analytics\prediction $prediction
+     * @param bool $includedetailsaction
+     * @return \core_analytics\prediction_action[]
+     */
     public function prediction_actions(\core_analytics\prediction $prediction, $includedetailsaction = false) {
         global $USER;
 
@@ -57,17 +67,24 @@ public function prediction_actions(\core_analytics\prediction $prediction, $incl
         // Send a message.
         $url = new \moodle_url('/message/index.php', array('user' => $USER->id, 'id' => $studentid));
         $pix = new \pix_icon('t/message', get_string('sendmessage', 'message'));
-        $actions['studentmessage'] = new \core_analytics\prediction_action('studentmessage', $prediction, $url, $pix, get_string('sendmessage', 'message'));
+        $actions['studentmessage'] = new \core_analytics\prediction_action('studentmessage', $prediction, $url, $pix,
+            get_string('sendmessage', 'message'));
 
         // View outline report.
         $url = new \moodle_url('/report/outline/user.php', array('id' => $studentid, 'course' => $sampledata['course']->id,
             'mode' => 'outline'));
         $pix = new \pix_icon('i/report', get_string('outlinereport'));
-        $actions['viewoutlinereport'] = new \core_analytics\prediction_action('viewoutlinereport', $prediction, $url, $pix, get_string('outlinereport'));
+        $actions['viewoutlinereport'] = new \core_analytics\prediction_action('viewoutlinereport', $prediction, $url, $pix,
+            get_string('outlinereport'));
 
         return $actions;
     }
 
+    /**
+     * classes_description
+     *
+     * @return string[]
+     */
     protected static function classes_description() {
         return array(
             get_string('labelstudentdropoutno', 'tool_models'),
@@ -86,10 +103,22 @@ protected function ignored_predicted_classes() {
         return array();
     }
 
+    /**
+     * get_analyser_class
+     *
+     * @return string
+     */
     public function get_analyser_class() {
         return '\\core_analytics\\local\\analyser\\student_enrolments';
     }
 
+    /**
+     * is_valid_analysable
+     *
+     * @param \core_analytics\analysable $course
+     * @param bool $fortraining
+     * @return true|string
+     */
     public function is_valid_analysable(\core_analytics\analysable $course, $fortraining = true) {
         global $DB;
 
@@ -145,7 +174,7 @@ public function is_valid_analysable(\core_analytics\analysable $course, $fortrai
      * @param int $sampleid
      * @param \core_analytics\analysable $course
      * @param bool $fortraining
-     * @return bool
+     * @return true|string
      */
     public function is_valid_sample($sampleid, \core_analytics\analysable $course, $fortraining = true) {
         return true;
@@ -160,7 +189,9 @@ public function is_valid_sample($sampleid, \core_analytics\analysable $course, $
      *
      * @param int $sampleid
      * @param \core_analytics\analysable $course
-     * @return void
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
      */
     protected function calculate_sample($sampleid, \core_analytics\analysable $course, $starttime = false, $endtime = false) {
 
diff --git a/admin/tool/models/classes/analytics/target/no_teaching.php b/admin/tool/models/classes/analytics/target/no_teaching.php
index 8c0194c2cc1f1..e35bb90bcd803 100644
--- a/admin/tool/models/classes/analytics/target/no_teaching.php
+++ b/admin/tool/models/classes/analytics/target/no_teaching.php
@@ -44,10 +44,22 @@ public static function based_on_assumptions() {
         return true;
     }
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('target:noteachingactivity', 'tool_models');
     }
 
+    /**
+     * prediction_actions
+     *
+     * @param \core_analytics\prediction $prediction
+     * @param mixed $includedetailsaction
+     * @return \core_analytics\prediction_action[]
+     */
     public function prediction_actions(\core_analytics\prediction $prediction, $includedetailsaction = false) {
         global $USER;
 
@@ -79,6 +91,11 @@ public function prediction_actions(\core_analytics\prediction $prediction, $incl
         return $actions;
     }
 
+    /**
+     * classes_description
+     *
+     * @return string[]
+     */
     protected static function classes_description() {
         return array(
             get_string('labelteachingyes', 'tool_models'),
@@ -96,10 +113,22 @@ protected function ignored_predicted_classes() {
         return array(0);
     }
 
+    /**
+     * get_analyser_class
+     *
+     * @return string
+     */
     public function get_analyser_class() {
         return '\\core_analytics\\local\\analyser\\site_courses';
     }
 
+    /**
+     * is_valid_analysable
+     *
+     * @param \core_analytics\analysable $analysable
+     * @param mixed $fortraining
+     * @return true|string
+     */
     public function is_valid_analysable(\core_analytics\analysable $analysable, $fortraining = true) {
         // The analysable is the site, so yes, it is always valid.
         return true;
@@ -108,10 +137,10 @@ public function is_valid_analysable(\core_analytics\analysable $analysable, $for
     /**
      * Only process samples which start date is getting close.
      *
-     * @param mixed $sampleid
+     * @param int $sampleid
      * @param \core_analytics\analysable $analysable
      * @param bool $fortraining
-     * @return void
+     * @return true|string
      */
     public function is_valid_sample($sampleid, \core_analytics\analysable $analysable, $fortraining = true) {
 
@@ -132,7 +161,9 @@ public function is_valid_sample($sampleid, \core_analytics\analysable $analysabl
      *
      * @param int $sampleid
      * @param \core_analytics\analysable $analysable
-     * @return void
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
      */
     protected function calculate_sample($sampleid, \core_analytics\analysable $analysable, $starttime = false, $endtime = false) {
 
diff --git a/admin/tool/models/classes/output/form/edit_model.php b/admin/tool/models/classes/output/form/edit_model.php
index 86a3b6de6b893..095c0b67db0b1 100644
--- a/admin/tool/models/classes/output/form/edit_model.php
+++ b/admin/tool/models/classes/output/form/edit_model.php
@@ -24,6 +24,8 @@
 
 namespace tool_models\output\form;
 
+defined('MOODLE_INTERNAL') || die();
+
 require_once($CFG->dirroot.'/lib/formslib.php');
 
 /**
diff --git a/admin/tool/models/classes/output/helper.php b/admin/tool/models/classes/output/helper.php
index 8420b1a8fc8ab..c091f468779ee 100644
--- a/admin/tool/models/classes/output/helper.php
+++ b/admin/tool/models/classes/output/helper.php
@@ -24,8 +24,10 @@
 
 namespace tool_models\output;
 
+defined('MOODLE_INTERNAL') || die();
+
 /**
- * Typical crappy helper class with tiny functions.
+ * Helper class with general purpose tiny functions.
  *
  * @package   tool_models
  * @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
@@ -33,6 +35,12 @@
  */
 class helper {
 
+    /**
+     * Converts a class full name to a select option key
+     *
+     * @param string $class
+     * @return string
+     */
     public static function class_to_option($class) {
         // Form field is PARAM_ALPHANUMEXT and we are sending fully qualified class names
         // as option names, but replacing the backslash for a string that is really unlikely
@@ -40,6 +48,12 @@ public static function class_to_option($class) {
         return str_replace('\\', '2015102400ouuu', $class);
     }
 
+    /**
+     * option_to_class
+     *
+     * @param string $option
+     * @return string
+     */
     public static function option_to_class($option) {
         // Really unlikely but yeah, I'm a bad booyyy.
         return str_replace('2015102400ouuu', '\\', $option);
diff --git a/admin/tool/models/classes/output/models_list.php b/admin/tool/models/classes/output/models_list.php
index 338a0c7f43c24..2894e762fd2d3 100644
--- a/admin/tool/models/classes/output/models_list.php
+++ b/admin/tool/models/classes/output/models_list.php
@@ -35,8 +35,19 @@
  */
 class models_list implements \renderable, \templatable {
 
+    /**
+     * models
+     *
+     * @var \core_analytics\model[]
+     */
     protected $models = array();
 
+    /**
+     * __construct
+     *
+     * @param \core_analytics\model[] $models
+     * @return void
+     */
     public function __construct($models) {
         $this->models = $models;
     }
diff --git a/admin/tool/models/classes/output/renderer.php b/admin/tool/models/classes/output/renderer.php
index 9f06357e41d85..6110aeecf61be 100644
--- a/admin/tool/models/classes/output/renderer.php
+++ b/admin/tool/models/classes/output/renderer.php
@@ -106,7 +106,8 @@ public function render_evaluate_results($results, $logs = array()) {
 
             if (isset($result->score)) {
                 // Score.
-                $output .= $OUTPUT->heading(get_string('accuracy', 'tool_models') . ': ' . round(floatval($result->score), 4) * 100  . '%', 4);
+                $output .= $OUTPUT->heading(get_string('accuracy', 'tool_models') . ': ' .
+                    round(floatval($result->score), 4) * 100  . '%', 4);
             }
 
             if (!empty($result->info)) {
diff --git a/admin/tool/models/classes/task/predict_models.php b/admin/tool/models/classes/task/predict_models.php
index 366b8b6c8b873..9f4d3db1d2ba9 100644
--- a/admin/tool/models/classes/task/predict_models.php
+++ b/admin/tool/models/classes/task/predict_models.php
@@ -1,5 +1,4 @@
 <?php
-
 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
@@ -25,6 +24,8 @@
 
 namespace tool_models\task;
 
+defined('MOODLE_INTERNAL') || die();
+
 /**
  * Predict system models with new data available.
  *
@@ -34,10 +35,20 @@
  */
 class predict_models extends \core\task\scheduled_task {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public function get_name() {
         return get_string('predictmodels', 'tool_models');
     }
 
+    /**
+     * Executes the prediction task.
+     *
+     * @return void
+     */
     public function execute() {
         global $OUTPUT, $PAGE;
 
diff --git a/admin/tool/models/classes/task/train_models.php b/admin/tool/models/classes/task/train_models.php
index cbe1f2e83efe2..bd2af8e252bde 100644
--- a/admin/tool/models/classes/task/train_models.php
+++ b/admin/tool/models/classes/task/train_models.php
@@ -1,5 +1,4 @@
 <?php
-
 // This file is part of Moodle - http://moodle.org/
 //
 // Moodle is free software: you can redistribute it and/or modify
@@ -25,6 +24,8 @@
 
 namespace tool_models\task;
 
+defined('MOODLE_INTERNAL') || die();
+
 /**
  * Train system models with new data available.
  *
@@ -34,10 +35,20 @@
  */
 class train_models extends \core\task\scheduled_task {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public function get_name() {
         return get_string('trainmodels', 'tool_models');
     }
 
+    /**
+     * Executes the prediction task.
+     *
+     * @return void
+     */
     public function execute() {
         global $OUTPUT, $PAGE;
 
diff --git a/admin/tool/models/cli/guess_course_start_and_end.php b/admin/tool/models/cli/guess_course_start_and_end.php
index 50fa374324518..bf01bfd26cf6a 100644
--- a/admin/tool/models/cli/guess_course_start_and_end.php
+++ b/admin/tool/models/cli/guess_course_start_and_end.php
@@ -101,6 +101,13 @@
 $courses->close();
 
 
+/**
+ * tool_models_calculate_course_dates
+ *
+ * @param stdClass $course
+ * @param array $options CLI options
+ * @return void
+ */
 function tool_models_calculate_course_dates($course, $options) {
     global $DB, $OUTPUT;
 
@@ -153,7 +160,8 @@ function tool_models_calculate_course_dates($course, $options) {
             if ($options['update']) {
                 format_weeks::update_end_date($course->id);
                 $course->enddate = $DB->get_field('course', 'enddate', array('id' => $course->id));
-                $notification .= PHP_EOL . '  ' . get_string('weeksenddateautomaticallyset', 'tool_models') . ': ' . userdate($course->enddate);
+                $notification .= PHP_EOL . '  ' . get_string('weeksenddateautomaticallyset', 'tool_models') . ': ' .
+                    userdate($course->enddate);
             } else {
                 // We can't provide more info without actually updating it in db.
                 $notification .= PHP_EOL . '  ' . get_string('weeksenddatedefault', 'tool_models');
@@ -194,4 +202,6 @@ function tool_models_calculate_course_dates($course, $options) {
     echo mtrace($notification);
 }
 
+echo mtrace(get_string('success'));
+
 exit(0);
diff --git a/admin/tool/models/db/tasks.php b/admin/tool/models/db/tasks.php
index 276a2775328b3..13e21f62a1061 100644
--- a/admin/tool/models/db/tasks.php
+++ b/admin/tool/models/db/tasks.php
@@ -17,11 +17,13 @@
 /**
  * This file defines tasks performed by the tool.
  *
- * @package    tool_monitor
- * @copyright  2014 Mark Nelson <markn@moodle.com>
+ * @package    tool_models
+ * @copyright  2017 David Monllao {@link http://www.davidmonllao.com}
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
+
 // List of tasks.
 $tasks = array(
     array(
diff --git a/admin/tool/models/db/uninstall.php b/admin/tool/models/db/uninstall.php
index d1db7817a8724..2eb1e931efd9b 100644
--- a/admin/tool/models/db/uninstall.php
+++ b/admin/tool/models/db/uninstall.php
@@ -24,6 +24,13 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+/**
+ * Deletes models created by tool_models
+ *
+ * @package    tool_models
+ * @copyright  2017 David Monllao {@link http://www.davidmonllao.com}
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 function xmldb_tool_models_uninstall() {
     global $DB;
 
diff --git a/admin/tool/models/index.php b/admin/tool/models/index.php
index 76176fc232e90..415a4885ecceb 100644
--- a/admin/tool/models/index.php
+++ b/admin/tool/models/index.php
@@ -25,7 +25,7 @@
 require_once(__DIR__ . '/../../../config.php');
 require_once($CFG->libdir . '/adminlib.php');
 
-admin_externalpage_setup('analyticmodels', '', null, '', array('pagelayout'=>'report'));
+admin_externalpage_setup('analyticmodels', '', null, '', array('pagelayout' => 'report'));
 
 $models = \core_analytics\manager::get_all_models();
 
diff --git a/admin/tool/models/model.php b/admin/tool/models/model.php
index 676585b8b1303..26c3fb201a191 100644
--- a/admin/tool/models/model.php
+++ b/admin/tool/models/model.php
@@ -17,7 +17,7 @@
 /**
  * Model-related actions.
  *
- * @package    tool_model
+ * @package    tool_models
  * @copyright  2017 David Monllao {@link http://www.davidmonllao.com}
  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
diff --git a/analytics/classes/admin_setting_predictor.php b/analytics/classes/admin_setting_predictor.php
index e1b0b6aace309..203ad5542e619 100644
--- a/analytics/classes/admin_setting_predictor.php
+++ b/analytics/classes/admin_setting_predictor.php
@@ -15,6 +15,7 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
+ * Extension to show an error message if the selected predictor is not available.
  *
  * @package   core_analytics
  * @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
@@ -27,6 +28,13 @@
 
 require_once(__DIR__ . '/../../lib/adminlib.php');
 
+/**
+ * Extension to show an error message if the selected predictor is not available.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 class admin_setting_predictor extends \admin_setting_configselect {
 
     /**
@@ -40,7 +48,7 @@ public function write_setting($data) {
             return '';
         }
         if (!array_key_exists($data, $this->choices)) {
-            return ''; // ignore it
+            return '';
         }
 
         // Calling it here without checking if it is ready because we check it below and show it as a controlled case.
diff --git a/analytics/classes/analysable.php b/analytics/classes/analysable.php
index a5187b12915f9..88d10a6bf96ee 100644
--- a/analytics/classes/analysable.php
+++ b/analytics/classes/analysable.php
@@ -15,6 +15,7 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
+ * Any element analysers can analyse.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -26,6 +27,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 /**
+ * Any element analysers can analyse.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -33,13 +35,36 @@
  */
 interface analysable {
 
+    /**
+     * Max timestamp.
+     */
     const MAX_TIME = 9999999999;
 
+    /**
+     * The analysable unique identifier in the site.
+     *
+     * @return int.
+     */
     public function get_id();
 
+    /**
+     * The analysable context.
+     *
+     * @return \context
+     */
     public function get_context();
 
+    /**
+     * The start of the analysable if there is one.
+     *
+     * @return int|false
+     */
     public function get_start();
 
+    /**
+     * The end of the analysable if there is one.
+     *
+     * @return int|false
+     */
     public function get_end();
 }
diff --git a/analytics/classes/calculable.php b/analytics/classes/calculable.php
index 29147b76f8971..7d4597bd01795 100644
--- a/analytics/classes/calculable.php
+++ b/analytics/classes/calculable.php
@@ -35,10 +35,29 @@
  */
 abstract class calculable {
 
+    /**
+     * Neutral calculation outcome.
+     */
     const OUTCOME_NEUTRAL = 0;
+
+    /**
+     * Very positive calculation outcome.
+     */
     const OUTCOME_VERY_POSITIVE = 1;
+
+    /**
+     * Positive calculation outcome.
+     */
     const OUTCOME_OK = 2;
+
+    /**
+     * Negative calculation outcome.
+     */
     const OUTCOME_NEGATIVE = 3;
+
+    /**
+     * Very negative calculation outcome.
+     */
     const OUTCOME_VERY_NEGATIVE = 4;
 
     /**
@@ -243,7 +262,6 @@ protected function classify_value($value, $ranges) {
      * Merges arrays recursively keeping the same keys the original arrays have.
      *
      * @link http://php.net/manual/es/function.array-merge-recursive.php#114818
-     * @param array
      * @return array
      */
     private function array_merge_recursive_keep_keys() {
@@ -256,8 +274,8 @@ private function array_merge_recursive_keep_keys() {
                 if (is_array($value) && !empty($base[$key]) && is_array($base[$key])) {
                     $base[$key] = $this->array_merge_recursive_keep_keys($base[$key], $value);
                 } else {
-                    if(isset($base[$key]) && is_int($key)) {
-                      $key++;
+                    if (isset($base[$key]) && is_int($key)) {
+                        $key++;
                     }
                     $base[$key] = $value;
                 }
diff --git a/analytics/classes/course.php b/analytics/classes/course.php
index 2d8ee540dc751..6dee6cf8d632d 100644
--- a/analytics/classes/course.php
+++ b/analytics/classes/course.php
@@ -15,6 +15,7 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
+ * Moodle course analysable
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -30,6 +31,7 @@
 require_once($CFG->dirroot . '/lib/enrollib.php');
 
 /**
+ * Moodle course analysable
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -37,24 +39,81 @@
  */
 class course implements \core_analytics\analysable {
 
+    /**
+     * @var \core_analytics\course[] $instances
+     */
     protected static $instances = array();
 
-    protected static $studentroles = [];
-    protected static $teacherroles = [];
-
+    /**
+     * Course object
+     *
+     * @var \stdClass
+     */
     protected $course = null;
+
+    /**
+     * The course context.
+     *
+     * @var \context_course
+     */
     protected $coursecontext = null;
 
+    /**
+     * The course activities organized by activity type.
+     *
+     * @var array
+     */
     protected $courseactivities = array();
 
+    /**
+     * Course start time.
+     *
+     * @var int
+     */
     protected $starttime = null;
+
+
+    /**
+     * Has the course already started?
+     *
+     * @var bool
+     */
     protected $started = null;
+
+    /**
+     * Course end time.
+     *
+     * @var int
+     */
     protected $endtime = null;
+
+    /**
+     * Is the course finished?
+     *
+     * @var bool
+     */
     protected $finished = null;
 
+    /**
+     * Course students ids.
+     *
+     * @var int[]
+     */
     protected $studentids = [];
+
+
+    /**
+     * Course teachers ids
+     *
+     * @var int[]
+     */
     protected $teacherids = [];
 
+    /**
+     * Cached copy of the total number of logs in the course.
+     *
+     * @var int
+     */
     protected $ntotallogs = null;
 
     /**
@@ -78,18 +137,14 @@ public function __construct($course) {
 
         $this->coursecontext = \context_course::instance($this->course->id);
 
-        if (empty(self::$studentroles)) {
-            self::$studentroles = array_keys(get_archetype_roles('student'));
-        }
-        if (empty(self::$teacherroles)) {
-            self::$teacherroles = array_keys(get_archetype_roles('editingteacher') + get_archetype_roles('teacher'));
-        }
-
         $this->now = time();
 
         // Get the course users, including users assigned to student and teacher roles at an higher context.
-        $this->studentids = $this->get_user_ids(self::$studentroles);
-        $this->teacherids = $this->get_user_ids(self::$teacherroles);
+        $studentroles = array_keys(get_archetype_roles('student'));
+        $this->studentids = $this->get_user_ids($studentroles);
+
+        $teacherroles = array_keys(get_archetype_roles('editingteacher') + get_archetype_roles('teacher'));
+        $this->teacherids = $this->get_user_ids($teacherroles);
     }
 
     /**
@@ -114,10 +169,20 @@ public static function instance($course) {
         return self::$instances[$courseid];
     }
 
+    /**
+     * get_id
+     *
+     * @return int
+     */
     public function get_id() {
         return $this->course->id;
     }
 
+    /**
+     * get_context
+     *
+     * @return \context
+     */
     public function get_context() {
         if ($this->coursecontext === null) {
             $this->coursecontext = \context_course::instance($this->course->id);
@@ -147,6 +212,11 @@ public function get_start() {
         return $this->starttime;
     }
 
+    /**
+     * Guesses the start of the course based on students' activity and enrolment start dates.
+     *
+     * @return int
+     */
     public function guess_start() {
         global $DB;
 
@@ -168,8 +238,10 @@ public function guess_start() {
             $select = "userid = :userid AND contextlevel = :contextlevel AND contextinstanceid = :contextinstanceid";
             $params = array('userid' => $studentid, 'contextlevel' => CONTEXT_COURSE, 'contextinstanceid' => $this->get_id());
             $events = $logstore->get_events_select($select, $params, 'timecreated ASC', 0, 1);
-            $event = reset($events);
-            $firstlogs = $event->timecreated;
+            if ($events) {
+                $event = reset($events);
+                $firstlogs[] = $event->timecreated;
+            }
         }
         if (empty($firstlogs)) {
             // Can't guess if no student accesses.
@@ -257,6 +329,11 @@ public function guess_end() {
         return $this->median($studentlastaccesses);
     }
 
+    /**
+     * Returns a course plain object.
+     *
+     * @return \stdClass
+     */
     public function get_course_data() {
         return $this->course;
     }
@@ -362,6 +439,12 @@ public function get_total_logs() {
         return $this->ntotallogs;
     }
 
+    /**
+     * Returns all the activities of the provided type the course has.
+     *
+     * @param string $activitytype
+     * @return array
+     */
     public function get_all_activities($activitytype) {
 
         // Using is set because we set it to false if there are no activities.
@@ -383,6 +466,12 @@ public function get_all_activities($activitytype) {
         return $this->courseactivities[$activitytype];
     }
 
+    /**
+     * Returns the course students grades.
+     *
+     * @param array $courseactivities
+     * @return array
+     */
     public function get_student_grades($courseactivities) {
 
         if (empty($courseactivities)) {
@@ -410,9 +499,18 @@ public function get_student_grades($courseactivities) {
         return $grades;
     }
 
+    /**
+     * Guesses all activities that were available during a period of time.
+     *
+     * @param string $activitytype
+     * @param int $starttime
+     * @param int $endtime
+     * @param \stdClass $student
+     * @return array
+     */
     public function get_activities($activitytype, $starttime, $endtime, $student = false) {
 
-        // $student may not be available, default to not calculating dynamic data.
+        // Var $student may not be available, default to not calculating dynamic data.
         $studentid = -1;
         if ($student) {
             $studentid = $student->id;
@@ -432,6 +530,14 @@ public function get_activities($activitytype, $starttime, $endtime, $student = f
         return $timerangeactivities;
     }
 
+    /**
+     * Was the activity supposed to be completed during the provided time range?.
+     *
+     * @param \cm_info $activity
+     * @param int $starttime
+     * @param int $endtime
+     * @return bool
+     */
     protected function completed_by(\cm_info $activity, $starttime, $endtime) {
 
         // We can't check uservisible because:
@@ -455,7 +561,7 @@ protected function completed_by(\cm_info $activity, $starttime, $endtime) {
             }
         }
 
-        //// We skip activities in sections that were not yet visible or their 'until' was not in this $starttime - $endtime range.
+        // We skip activities in sections that were not yet visible or their 'until' was not in this $starttime - $endtime range.
         $section = $activity->get_modinfo()->get_section_info($activity->sectionnum);
         if ($section->availability) {
             $info = new \core_availability\info_section($section);
@@ -524,6 +630,14 @@ protected function completed_by(\cm_info $activity, $starttime, $endtime) {
         return false;
     }
 
+    /**
+     * Check if the activity/section should have been completed during the provided period according to its availability rules.
+     *
+     * @param \core_availability\info $info
+     * @param int $starttime
+     * @param int $endtime
+     * @return bool|null
+     */
     protected function availability_completed_by(\core_availability\info $info, $starttime, $endtime) {
 
         $dateconditions = $info->get_availability_tree()->get_all_children('\availability_date\condition');
@@ -576,6 +690,7 @@ protected function update_loop_times($start, $end) {
     /**
      * Returns the query and params used to filter the logstore by this course students.
      *
+     * @param string $prefix
      * @return array
      */
     protected function course_students_query_filter($prefix = false) {
diff --git a/analytics/classes/dataset_manager.php b/analytics/classes/dataset_manager.php
index 115f1cbd824ea..fe34cbb897348 100644
--- a/analytics/classes/dataset_manager.php
+++ b/analytics/classes/dataset_manager.php
@@ -15,6 +15,7 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
+ * Datasets manager.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -26,6 +27,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 /**
+ * Datasets manager.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -33,8 +35,19 @@
  */
 class dataset_manager {
 
+    /**
+     * File area for labelled datasets.
+     */
     const LABELLED_FILEAREA = 'labelled';
+
+    /**
+     * File area for unlabelled datasets.
+     */
     const UNLABELLED_FILEAREA = 'unlabelled';
+
+    /**
+     * Evaluation file file name.
+     */
     const EVALUATION_FILENAME = 'evaluation.csv';
 
     /**
@@ -71,8 +84,13 @@ class dataset_manager {
     protected $includetarget;
 
     /**
-     * Simple constructor.
+     * Constructor method.
      *
+     * @param int $modelid
+     * @param int $analysableid
+     * @param string $timesplittingid
+     * @param bool $evaluation
+     * @param bool $includetarget
      * @return void
      */
     public function __construct($modelid, $analysableid, $timesplittingid, $evaluation = false, $includetarget = false) {
@@ -90,7 +108,8 @@ public function __construct($modelid, $analysableid, $timesplittingid, $evaluati
      */
     public function init_process() {
         $lockkey = 'modelid:' . $this->modelid . '-analysableid:' . $this->analysableid .
-            '-timesplitting:' . self::clean_time_splitting_id($this->timesplittingid) . '-includetarget:' . (int)$this->includetarget;
+            '-timesplitting:' . self::clean_time_splitting_id($this->timesplittingid) .
+            '-includetarget:' . (int)$this->includetarget;
 
         // Large timeout as processes may be quite long.
         $lockfactory = \core\lock\lock_config::get_lock_factory('core_analytics');
@@ -168,6 +187,13 @@ public static function get_previous_evaluation_file($modelid, $timesplittingid)
             '/timesplitting/' . self::clean_time_splitting_id($timesplittingid) . '/', self::EVALUATION_FILENAME);
     }
 
+    /**
+     * Deletes previous evaluation files of this model.
+     *
+     * @param int $modelid
+     * @param string $timesplittingid
+     * @return bool
+     */
     public static function delete_previous_evaluation_file($modelid, $timesplittingid) {
         $fs = get_file_storage();
         if ($file = self::get_previous_evaluation_file($modelid, $timesplittingid)) {
@@ -178,6 +204,14 @@ public static function delete_previous_evaluation_file($modelid, $timesplittingi
         return false;
     }
 
+    /**
+     * Returns this (model + analysable + time splitting) file.
+     *
+     * @param int $modelid
+     * @param int $analysableid
+     * @param string $timesplittingid
+     * @return \stored_file
+     */
     public static function get_evaluation_analysable_file($modelid, $analysableid, $timesplittingid) {
 
         // Delete previous file if it exists.
@@ -196,7 +230,6 @@ public static function get_evaluation_analysable_file($modelid, $analysableid, $
      * Important! It is the caller responsability to ensure that the datasets are compatible.
      *
      * @param array  $files
-     * @param string $filename
      * @param int    $modelid
      * @param string $timesplittingid
      * @param bool   $evaluation
@@ -277,6 +310,12 @@ public static function merge_datasets(array $files, $modelid, $timesplittingid,
         return $fs->create_file_from_pathname($filerecord, $tmpfilepath);
     }
 
+    /**
+     * Returns the dataset file data structured by sampleids using the indicators and target column names.
+     *
+     * @param \stored_file $dataset
+     * @return array
+     */
     public static function get_structured_data(\stored_file $dataset) {
 
         if ($dataset->get_filearea() !== 'unlabelled') {
@@ -315,6 +354,12 @@ public static function get_structured_data(\stored_file $dataset) {
         return $calculations;
     }
 
+    /**
+     * Delete all files of a model.
+     *
+     * @param int $modelid
+     * @return bool
+     */
     public static function clear_model_files($modelid) {
         $fs = get_file_storage();
         return $fs->delete_area_files(\context_system::instance()->id, 'analytics', false, $modelid);
@@ -331,6 +376,12 @@ protected static function clean_time_splitting_id($timesplittingid) {
         return clean_param($timesplittingid, PARAM_ALPHANUMEXT);
     }
 
+    /**
+     * Returns the file name to be used.
+     *
+     * @param strinbool $evaluation
+     * @return string
+     */
     protected static function get_filename($evaluation) {
 
         if ($evaluation === true) {
@@ -343,6 +394,12 @@ protected static function get_filename($evaluation) {
         return $filename;
     }
 
+    /**
+     * Returns the file area to be used.
+     *
+     * @param bool $includetarget
+     * @return string
+     */
     protected static function get_filearea($includetarget) {
 
         if ($includetarget === true) {
diff --git a/analytics/classes/local/analyser/base.php b/analytics/classes/local/analyser/base.php
index 96ba73208e5ef..f2dc76ba0c7b1 100644
--- a/analytics/classes/local/analyser/base.php
+++ b/analytics/classes/local/analyser/base.php
@@ -15,6 +15,7 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
+ * Analysers base class.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -26,6 +27,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 /**
+ * Analysers base class.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -33,16 +35,59 @@
  */
 abstract class base {
 
+    /**
+     * @var int
+     */
     protected $modelid;
 
+    /**
+     * The model target.
+     *
+     * @var \core_analytics\local\target\base
+     */
     protected $target;
+
+    /**
+     * The model indicators.
+     *
+     * @var \core_analytics\local\indicator\base[]
+     */
     protected $indicators;
+
+    /**
+     * Time splitting methods to use.
+     *
+     * Multiple time splitting methods during evaluation and 1 single
+     * time splitting method once the model is enabled.
+     *
+     * @var \core_analytics\local\time_splitting\base[]
+     */
     protected $timesplittings;
 
+    /**
+     * Execution options.
+     *
+     * @var array
+     */
     protected $options;
 
+    /**
+     * Simple log array.
+     *
+     * @var string[]
+     */
     protected $log;
 
+    /**
+     * Constructor method.
+     *
+     * @param int $modelid
+     * @param \core_analytics\local\target\base $target
+     * @param \core_analytics\local\indicator\base[] $indicators
+     * @param \core_analytics\local\time_splitting\base[] $timesplittings
+     * @param array $options
+     * @return void
+     */
     public function __construct($modelid, \core_analytics\local\target\base $target, $indicators, $timesplittings, $options) {
         $this->modelid = $modelid;
         $this->target = $target;
@@ -61,7 +106,7 @@ public function __construct($modelid, \core_analytics\local\target\base $target,
     }
 
     /**
-     * This function returns the list of samples that can be calculated.
+     * This function returns this analysable list of samples.
      *
      * @param \core_analytics\analysable $analysable
      * @return array array[0] = int[] (sampleids) and array[1] = array (samplesdata)
@@ -69,7 +114,7 @@ public function __construct($modelid, \core_analytics\local\target\base $target,
     abstract protected function get_all_samples(\core_analytics\analysable $analysable);
 
     /**
-     * get_samples
+     * This function returns the samples data from a list of sample ids.
      *
      * @param int[] $sampleids
      * @return array array[0] = int[] (sampleids) and array[1] = array (samplesdata)
@@ -77,7 +122,7 @@ abstract protected function get_all_samples(\core_analytics\analysable $analysab
     abstract public function get_samples($sampleids);
 
     /**
-     * get_sample_analysable
+     * Returns the analysable of a sample.
      *
      * @param int $sampleid
      * @return \core_analytics\analysable
@@ -85,13 +130,15 @@ abstract public function get_samples($sampleids);
     abstract public function get_sample_analysable($sampleid);
 
     /**
-     * get_samples_origin
+     * Returns the sample's origin in moodle database.
      *
      * @return string
      */
     abstract protected function get_samples_origin();
 
     /**
+     * Returns the context of a sample.
+     *
      * moodle/analytics:listinsights will be required at this level to access the sample predictions.
      *
      * @param int $sampleid
@@ -100,7 +147,7 @@ abstract protected function get_samples_origin();
     abstract public function sample_access_context($sampleid);
 
     /**
-     * sample_description
+     * Describes a sample with a description summary and a \renderable (an image for example)
      *
      * @param int $sampleid
      * @param int $contextid
@@ -109,10 +156,6 @@ abstract public function sample_access_context($sampleid);
      */
     abstract public function sample_description($sampleid, $contextid, $sampledata);
 
-    protected function provided_sample_data() {
-        return array($this->get_samples_origin());
-    }
-
     /**
      * Main analyser method which processes the site analysables.
      *
@@ -121,14 +164,34 @@ protected function provided_sample_data() {
      * In most of the cases you should have enough extending from one of these classes so you don't need
      * to reimplement this method.
      *
+     * @param bool $includetarget
      * @return \stored_file[]
      */
     abstract public function get_analysable_data($includetarget);
 
+    /**
+     * Samples data this analyser provides.
+     *
+     * @return string[]
+     */
+    protected function provided_sample_data() {
+        return array($this->get_samples_origin());
+    }
+
+    /**
+     * Returns labelled data (training and evaluation).
+     *
+     * @return array
+     */
     public function get_labelled_data() {
         return $this->get_analysable_data(true);
     }
 
+    /**
+     * Returns unlabelled data (prediction).
+     *
+     * @return array
+     */
     public function get_unlabelled_data() {
         return $this->get_analysable_data(false);
     }
@@ -151,7 +214,7 @@ protected function check_indicators_requirements() {
     }
 
     /**
-     * check_indicator_requirements
+     * Checks that this analyser satisfies the provided indicator requirements.
      *
      * @param \core_analytics\local\indicator\base $indicator
      * @return true|string[] True if all good, missing requirements list otherwise
@@ -248,7 +311,7 @@ public function process_analysable($analysable, $includetarget) {
 
             $a = new \stdClass();
             $a->analysableid = $analysable->get_id();
-            $a->errors =  implode(', ', $errors);
+            $a->errors = implode(', ', $errors);
             $this->add_log(get_string('analysablenotused', 'analytics', $a));
         }
 
@@ -256,7 +319,7 @@ public function process_analysable($analysable, $includetarget) {
     }
 
     /**
-     * add_log
+     * Adds a register to the analysis log.
      *
      * @param string $string
      * @return void
@@ -266,7 +329,7 @@ public function add_log($string) {
     }
 
     /**
-     * get_logs
+     * Returns the analysis logs.
      *
      * @return string[]
      */
@@ -274,12 +337,20 @@ public function get_logs() {
         return $this->log;
     }
 
+    /**
+     * Processes the analysable samples using the provided time splitting method.
+     *
+     * @param \core_analytics\local\time_splitting\base $timesplitting
+     * @param \core_analytics\analysable $analysable
+     * @param \core_analytics\local\target\base|false $target
+     * @return \stdClass Results object.
+     */
     protected function process_time_splitting($timesplitting, $analysable, $target = false) {
 
         $result = new \stdClass();
 
         if (!$timesplitting->is_valid_analysable($analysable)) {
-            $result->status = \core_analytics\model::ANALYSE_REJECTED_RANGE_PROCESSOR;
+            $result->status = \core_analytics\model::ANALYSABLE_REJECTED_TIME_SPLITTING_METHOD;
             $result->message = get_string('invalidanalysablefortimesplitting', 'analytics',
                 $timesplitting->get_name());
             return $result;
@@ -287,7 +358,8 @@ protected function process_time_splitting($timesplitting, $analysable, $target =
         $timesplitting->set_analysable($analysable);
 
         if (CLI_SCRIPT && !PHPUNIT_TEST) {
-            mtrace('Analysing id "' . $analysable->get_id() . '" with "' . $timesplitting->get_name() . '" time splitting method...');
+            mtrace('Analysing id "' . $analysable->get_id() . '" with "' . $timesplitting->get_name() .
+                '" time splitting method...');
         }
 
         // What is a sample is defined by the analyser, it can be an enrolment, a course, a user, a question
@@ -295,7 +367,7 @@ protected function process_time_splitting($timesplitting, $analysable, $target =
         list($sampleids, $samplesdata) = $this->get_all_samples($analysable);
 
         if (count($sampleids) === 0) {
-            $result->status = \core_analytics\model::ANALYSE_REJECTED_RANGE_PROCESSOR;
+            $result->status = \core_analytics\model::ANALYSABLE_REJECTED_TIME_SPLITTING_METHOD;
             $result->message = get_string('nodata', 'analytics');
             return $result;
         }
@@ -312,7 +384,7 @@ protected function process_time_splitting($timesplitting, $analysable, $target =
         if ($this->options['evaluation'] === false) {
 
             if (empty($ranges)) {
-                $result->status = \core_analytics\model::ANALYSE_REJECTED_RANGE_PROCESSOR;
+                $result->status = \core_analytics\model::ANALYSABLE_REJECTED_TIME_SPLITTING_METHOD;
                 $result->message = get_string('nonewdata', 'analytics');
                 return $result;
             }
@@ -321,7 +393,7 @@ protected function process_time_splitting($timesplitting, $analysable, $target =
             $sampleids = $this->filter_out_train_samples($sampleids, $timesplitting);
 
             if (count($sampleids) === 0) {
-                $result->status = \core_analytics\model::ANALYSE_REJECTED_RANGE_PROCESSOR;
+                $result->status = \core_analytics\model::ANALYSABLE_REJECTED_TIME_SPLITTING_METHOD;
                 $result->message = get_string('nonewdata', 'analytics');
                 return $result;
             }
@@ -335,7 +407,7 @@ protected function process_time_splitting($timesplitting, $analysable, $target =
             }
 
             if (count($ranges) === 0) {
-                $result->status = \core_analytics\model::ANALYSE_REJECTED_RANGE_PROCESSOR;
+                $result->status = \core_analytics\model::ANALYSABLE_REJECTED_TIME_SPLITTING_METHOD;
                 $result->message = get_string('nonewtimeranges', 'analytics');
                 return $result;
             }
@@ -375,13 +447,12 @@ protected function process_time_splitting($timesplitting, $analysable, $target =
             $target->add_sample_data($samplesdata);
         }
 
-
         // Here we start the memory intensive process that will last until $data var is
         // unset (until the method is finished basically).
         $data = $timesplitting->calculate($sampleids, $this->get_samples_origin(), $this->indicators, $ranges, $target);
 
         if (!$data) {
-            $result->status = \core_analytics\model::ANALYSE_REJECTED_RANGE_PROCESSOR;
+            $result->status = \core_analytics\model::ANALYSABLE_REJECTED_TIME_SPLITTING_METHOD;
             $result->message = get_string('novaliddata', 'analytics');
             $dataset->close_process();
             return $result;
@@ -410,6 +481,12 @@ protected function process_time_splitting($timesplitting, $analysable, $target =
         return $result;
     }
 
+    /**
+     * Returns the ranges of a time splitting that can be used to predict.
+     *
+     * @param \core_analytics\local\time_splitting\base $timesplitting
+     * @return array
+     */
     protected function get_prediction_ranges($timesplitting) {
 
         $now = time();
@@ -426,6 +503,13 @@ protected function get_prediction_ranges($timesplitting) {
         return $predictionranges;
     }
 
+    /**
+     * Filters out samples that have already been used for training.
+     *
+     * @param int[] $sampleids
+     * @param \core_analytics\local\time_splitting\base $timesplitting
+     * @return int[]
+     */
     protected function filter_out_train_samples($sampleids, $timesplitting) {
         global $DB;
 
@@ -448,6 +532,13 @@ protected function filter_out_train_samples($sampleids, $timesplitting) {
         return $sampleids;
     }
 
+    /**
+     * Filters out samples that have already been used for prediction.
+     *
+     * @param array $ranges
+     * @param \core_analytics\local\time_splitting\base $timesplitting
+     * @return int[]
+     */
     protected function filter_out_prediction_ranges($ranges, $timesplitting) {
         global $DB;
 
@@ -465,6 +556,14 @@ protected function filter_out_prediction_ranges($ranges, $timesplitting) {
 
     }
 
+    /**
+     * Saves samples that have just been used for training.
+     *
+     * @param int[] $sampleids
+     * @param \core_analytics\local\time_splitting\base $timesplitting
+     * @param \stored_file $file
+     * @return bool
+     */
     protected function save_train_samples($sampleids, $timesplitting, $file) {
         global $DB;
 
@@ -481,6 +580,13 @@ protected function save_train_samples($sampleids, $timesplitting, $file) {
         return $DB->insert_record('analytics_train_samples', $trainingsamples);
     }
 
+    /**
+     * Saves samples that have just been used for prediction.
+     *
+     * @param array $ranges
+     * @param \core_analytics\local\time_splitting\base $timesplitting
+     * @return void
+     */
     protected function save_prediction_ranges($ranges, $timesplitting) {
         global $DB;
 
diff --git a/analytics/classes/local/analyser/by_course.php b/analytics/classes/local/analyser/by_course.php
index 51c2ffaa82b18..e4feb14532d9c 100644
--- a/analytics/classes/local/analyser/by_course.php
+++ b/analytics/classes/local/analyser/by_course.php
@@ -15,6 +15,7 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
+ * Abstract analyser in course basis.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -26,6 +27,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 /**
+ * Abstract analyser in course basis.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -33,6 +35,11 @@
  */
 abstract class by_course extends base {
 
+    /**
+     * Return the list of courses to analyse.
+     *
+     * @return \core_analytics\course[]
+     */
     public function get_courses() {
 
         // Default to all system courses.
@@ -58,6 +65,12 @@ public function get_courses() {
         return $analysables;
     }
 
+    /**
+     * Returns the analysed data
+     *
+     * @param bool $includetarget
+     * @return \stored_file[]
+     */
     public function get_analysable_data($includetarget) {
 
         $status = array();
@@ -82,6 +95,13 @@ public function get_analysable_data($includetarget) {
         return $timesplittingfiles;
     }
 
+    /**
+     * Merges analysable dataset files into 1.
+     *
+     * @param array $filesbytimesplitting
+     * @param bool $includetarget
+     * @return \stored_file[]
+     */
     protected function merge_analysable_files($filesbytimesplitting, $includetarget) {
 
         $timesplittingfiles = array();
diff --git a/analytics/classes/local/analyser/courses.php b/analytics/classes/local/analyser/courses.php
index d87fea9b2e57a..fa33bd572edb7 100644
--- a/analytics/classes/local/analyser/courses.php
+++ b/analytics/classes/local/analyser/courses.php
@@ -35,12 +35,17 @@
  */
 class courses extends by_course {
 
+    /**
+     * Samples origin is course table.
+     *
+     * @return string
+     */
     public function get_samples_origin() {
         return 'course';
     }
 
     /**
-     * get_sample_analysable
+     * Returns the analysable of a sample
      *
      * @param int $sampleid
      * @return \core_analytics\analysable
@@ -49,16 +54,27 @@ public function get_sample_analysable($sampleid) {
         return \core_analytics\course::instance($sampleid);
     }
 
+    /**
+     * This provides samples' course and context.
+     *
+     * @return string[]
+     */
     protected function provided_sample_data() {
         return array('course', 'context');
     }
 
+    /**
+     * Returns the context of a sample.
+     *
+     * @param int $sampleid
+     * @return \context
+     */
     public function sample_access_context($sampleid) {
         return \context_course::instance($sampleid);
     }
 
     /**
-     * get_all_samples
+     * This will return just one course as we analyse 'by_course'.
      *
      * @param \core_analytics\analysable $course
      * @return array
@@ -76,7 +92,7 @@ protected function get_all_samples(\core_analytics\analysable $course) {
     }
 
     /**
-     * get_samples
+     * Returns samples data from sample ids.
      *
      * @param int[] $sampleids
      * @return array
@@ -99,12 +115,12 @@ public function get_samples($sampleids) {
     }
 
     /**
-     * sample_description
+     * Returns the sample description
      *
      * @param int $sampleid
      * @param int $contextid
      * @param array $sampledata
-     * @return array
+     * @return array array(string, \renderable)
      */
     public function sample_description($sampleid, $contextid, $sampledata) {
         $description = format_string($sampledata['course']->fullname, true, array('context' => $sampledata['context']));
diff --git a/analytics/classes/local/analyser/site_courses.php b/analytics/classes/local/analyser/site_courses.php
index a9e781f29a369..a3b1278ea78dc 100644
--- a/analytics/classes/local/analyser/site_courses.php
+++ b/analytics/classes/local/analyser/site_courses.php
@@ -35,12 +35,17 @@
  */
 class site_courses extends sitewide {
 
+    /**
+     * Samples origin is course table.
+     *
+     * @return string
+     */
     public function get_samples_origin() {
         return 'course';
     }
 
     /**
-     * get_sample_analysable
+     * Returns the sample analysable
      *
      * @param int $sampleid
      * @return \core_analytics\analysable
@@ -49,14 +54,31 @@ public function get_sample_analysable($sampleid) {
         return new \core_analytics\site();
     }
 
+    /**
+     * Data this analyer samples provide.
+     *
+     * @return string[]
+     */
     protected function provided_sample_data() {
         return array('course', 'context');
     }
 
+    /**
+     * Returns the sample context.
+     *
+     * @param int $sampleid
+     * @return \context
+     */
     public function sample_access_context($sampleid) {
         return \context_system::instance();
     }
 
+    /**
+     * Returns all site courses.
+     *
+     * @param \core_analytics\analysable $site
+     * @return array
+     */
     protected function get_all_samples(\core_analytics\analysable $site) {
         global $DB;
 
@@ -77,6 +99,12 @@ protected function get_all_samples(\core_analytics\analysable $site) {
         return array($sampleids, $courses);
     }
 
+    /**
+     * Return all complete samples data from sample ids.
+     *
+     * @param int[] $sampleids
+     * @return array
+     */
     public function get_samples($sampleids) {
         global $DB;
 
@@ -95,12 +123,12 @@ public function get_samples($sampleids) {
     }
 
     /**
-     * sample_description
+     * Returns the description of a sample.
      *
      * @param int $sampleid
      * @param int $contextid
      * @param array $sampledata
-     * @return void
+     * @return array array(string, \renderable)
      */
     public function sample_description($sampleid, $contextid, $sampledata) {
         $description = format_string($sampledata['course']->fullname, true, array('context' => $sampledata['context']));
diff --git a/analytics/classes/local/analyser/sitewide.php b/analytics/classes/local/analyser/sitewide.php
index ed91ce5cb05f9..1cffcc06570c3 100644
--- a/analytics/classes/local/analyser/sitewide.php
+++ b/analytics/classes/local/analyser/sitewide.php
@@ -15,6 +15,7 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
+ * Site-level contents abstract analysable.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -26,6 +27,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 /**
+ * Site-level contents abstract analysable.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -33,14 +35,16 @@
  */
 abstract class sitewide extends base {
 
-    protected function get_site() {
-        return new \core_analytics\site();
-    }
-
+    /**
+     * Returns the analysable data.
+     *
+     * @param bool $includetarget
+     * @return \stored_file[] One file for each time splitting method.
+     */
     public function get_analysable_data($includetarget) {
 
         // Here there is a single analysable and it is the system.
-        $analysable = $this->get_site();
+        $analysable = new \core_analytics\site();
 
         $return = array();
 
@@ -54,7 +58,7 @@ public function get_analysable_data($includetarget) {
                 \core_analytics\dataset_manager::delete_previous_evaluation_file($this->modelid, $timesplittingid);
             }
 
-            // We use merge but it is just a copy
+            // We use merge but it is just a copy.
             $files[$timesplittingid] = \core_analytics\dataset_manager::merge_datasets(array($file), $this->modelid,
                 $timesplittingid, $this->options['evaluation'], $includetarget);
         }
diff --git a/analytics/classes/local/analyser/student_enrolments.php b/analytics/classes/local/analyser/student_enrolments.php
index 970cabafc0aab..dbf26e6aa819e 100644
--- a/analytics/classes/local/analyser/student_enrolments.php
+++ b/analytics/classes/local/analyser/student_enrolments.php
@@ -15,6 +15,7 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
+ * Student enrolments analyser.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -28,6 +29,9 @@
 require_once($CFG->dirroot . '/lib/enrollib.php');
 
 /**
+ * Student enrolments analyser.
+ *
+ * It does return all student enrolments including the suspended ones.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -40,28 +44,52 @@ class student_enrolments extends by_course {
      */
     protected $samplecourses = array();
 
+    /**
+     * Defines the origin of the samples in the database.
+     *
+     * @return string
+     */
     protected function get_samples_origin() {
         return 'user_enrolments';
     }
 
+    /**
+     * Returns the student enrolment course context.
+     *
+     * @param int $sampleid
+     * @return \context
+     */
     public function sample_access_context($sampleid) {
         return \context_course::instance($this->get_sample_courseid($sampleid));
     }
 
+    /**
+     * Returns the student enrolment course.
+     *
+     * @param int $sampleid
+     * @return \core_analytics\analysable
+     */
     public function get_sample_analysable($sampleid) {
         $course = enrol_get_course_by_user_enrolment_id($sampleid);
         return \core_analytics\course::instance($course);
     }
 
+    /**
+     * Data provided by get_all_samples & get_samples.
+     *
+     * @return string[]
+     */
     protected function provided_sample_data() {
         return array('user_enrolments', 'context', 'course', 'user');
     }
 
     /**
-     * All course enrolments.
+     * All course student enrolments.
+     *
+     * It does return all student enrolments including the suspended ones.
      *
      * @param \core_analytics\analysable $course
-     * @return void
+     * @return array
      */
     protected function get_all_samples(\core_analytics\analysable $course) {
 
@@ -111,6 +139,12 @@ protected function get_all_samples(\core_analytics\analysable $course) {
         return array(array_combine($enrolids, $enrolids), $samplesdata);
     }
 
+    /**
+     * Returns all samples from the samples ids.
+     *
+     * @param int[] $sampleids
+     * @return array
+     */
     public function get_samples($sampleids) {
         global $DB;
 
@@ -189,7 +223,7 @@ protected function get_sample_courseid($sampleid) {
      * @param int $sampleid
      * @param int $contextid
      * @param array $sampledata
-     * @return array
+     * @return array array(string, \renderable)
      */
     public function sample_description($sampleid, $contextid, $sampledata) {
         $description = fullname($sampledata['user'], true, array('context' => $contextid));
diff --git a/analytics/classes/local/indicator/any_access_after_end.php b/analytics/classes/local/indicator/any_access_after_end.php
index 4143817c1348b..8a7b39b5e3b8d 100644
--- a/analytics/classes/local/indicator/any_access_after_end.php
+++ b/analytics/classes/local/indicator/any_access_after_end.php
@@ -35,14 +35,33 @@
  */
 class any_access_after_end extends binary {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:accessesafterend', 'analytics');
     }
 
+    /**
+     * required_sample_data
+     *
+     * @return string[]
+     */
     public static function required_sample_data() {
         return array('user', 'course', 'context');
     }
 
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param string $samplesorigin
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
     protected function calculate_sample($sampleid, $samplesorigin, $starttime = false, $endtime = false) {
         global $DB;
 
diff --git a/analytics/classes/local/indicator/any_access_before_start.php b/analytics/classes/local/indicator/any_access_before_start.php
index dd5647ab48f3d..ef5fae335e646 100644
--- a/analytics/classes/local/indicator/any_access_before_start.php
+++ b/analytics/classes/local/indicator/any_access_before_start.php
@@ -35,14 +35,33 @@
  */
 class any_access_before_start extends binary {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:accessesbeforestart', 'analytics');
     }
 
+    /**
+     * required_sample_data
+     *
+     * @return string[]
+     */
     public static function required_sample_data() {
         return array('user', 'course', 'context');
     }
 
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param string $samplesorigin
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
     protected function calculate_sample($sampleid, $samplesorigin, $starttime = false, $endtime = false) {
         global $DB;
 
diff --git a/analytics/classes/local/indicator/any_write_action.php b/analytics/classes/local/indicator/any_write_action.php
index 77b06506da68d..e97927161ccd8 100644
--- a/analytics/classes/local/indicator/any_write_action.php
+++ b/analytics/classes/local/indicator/any_write_action.php
@@ -35,15 +35,34 @@
  */
 class any_write_action extends binary {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:anywrite', 'analytics');
     }
 
+    /**
+     * required_sample_data
+     *
+     * @return string[]
+     */
     public static function required_sample_data() {
         // User is not required, calculate_sample can handle its absence.
         return array('context');
     }
 
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param string $sampleorigin
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
     protected function calculate_sample($sampleid, $sampleorigin, $starttime = false, $endtime = false) {
         global $DB;
 
diff --git a/analytics/classes/local/indicator/base.php b/analytics/classes/local/indicator/base.php
index f08c310d4b3fc..310dc55fb7c5b 100644
--- a/analytics/classes/local/indicator/base.php
+++ b/analytics/classes/local/indicator/base.php
@@ -35,12 +35,18 @@
  */
 abstract class base extends \core_analytics\calculable {
 
+    /**
+     * Min value an indicator can return.
+     */
     const MIN_VALUE = -1;
 
+    /**
+     * Max value an indicator can return.
+     */
     const MAX_VALUE = 1;
 
     /**
-     * Converts the calculated indicators to feature/s.
+     * Converts the calculated indicators to dataset feature/s.
      *
      * @param float|int[] $calculatedvalues
      * @return array
@@ -60,26 +66,57 @@ abstract protected function to_features($calculatedvalues);
      */
     abstract protected function calculate_sample($sampleid, $sampleorigin, $starttime, $endtime);
 
+    /**
+     * Should this value be displayed?
+     *
+     * Indicators providing multiple features can be used this method to discard some of them.
+     *
+     * @param float $value
+     * @param string $subtype
+     * @return bool
+     */
     public function should_be_displayed($value, $subtype) {
         // We should everything by default.
         return true;
     }
 
     /**
-     * @return null|string
+     * Allows indicators to specify data they need.
+     *
+     * e.g. A model using courses as samples will not provide users data, but an indicator like
+     * "user is hungry" needs user data.
+     *
+     * @return null|string[] Name of the required elements (use the database tablename)
      */
     public static function required_sample_data() {
         return null;
     }
 
+    /**
+     * Returns an instance of the indicator.
+     *
+     * Useful to reset cached data.
+     *
+     * @return \core_analytics\local\indicator\base
+     */
     public static function instance() {
         return new static();
     }
 
+    /**
+     * Returns the maximum value an indicator calculation can return.
+     *
+     * @return float
+     */
     public static function get_max_value() {
         return self::MAX_VALUE;
     }
 
+    /**
+     * Returns the minimum value an indicator calculation can return.
+     *
+     * @return float
+     */
     public static function get_min_value() {
         return self::MIN_VALUE;
     }
@@ -89,7 +126,7 @@ public static function get_min_value() {
      *
      * Returns an array of values which size matches $sampleids size.
      *
-     * @param array $sampleids
+     * @param int[] $sampleids
      * @param string $samplesorigin
      * @param integer $starttime Limit the calculation to this timestart
      * @param integer $endtime Limit the calculation to this timeend
@@ -118,17 +155,4 @@ public function calculate($sampleids, $samplesorigin, $starttime = false, $endti
 
         return $calculations;
     }
-
-    protected static function add_samples_averages() {
-        return false;
-    }
-
-    protected static function get_average_columns() {
-        return array('mean');
-    }
-
-    protected function calculate_averages($values) {
-        $mean = array_sum($values) / count($values);
-        return array($mean);
-    }
 }
diff --git a/analytics/classes/local/indicator/binary.php b/analytics/classes/local/indicator/binary.php
index a44e669f547ac..b642475d9016f 100644
--- a/analytics/classes/local/indicator/binary.php
+++ b/analytics/classes/local/indicator/binary.php
@@ -35,6 +35,11 @@
  */
 abstract class binary extends discrete {
 
+    /**
+     * get_classes
+     *
+     * @return array
+     */
     public static final function get_classes() {
         // It does not really matter, all \core_analytics\local\indicator\discrete get_classes calls have been overwriten as we
         // only need 1 column here.
@@ -79,11 +84,22 @@ public function get_calculation_outcome($value, $subtype = false) {
         }
     }
 
+    /**
+     * get_feature_headers
+     *
+     * @return array
+     */
     public static function get_feature_headers() {
         // Just 1 single feature obtained from the calculated value.
         return array(get_called_class());
     }
 
+    /**
+     * to_features
+     *
+     * @param array $calculatedvalues
+     * @return array
+     */
     protected function to_features($calculatedvalues) {
         // Indicators with binary values have only 1 feature for indicator, here we do nothing else
         // than converting each sample scalar value to an array of scalars with 1 element.
diff --git a/analytics/classes/local/indicator/community_of_inquiry_activity.php b/analytics/classes/local/indicator/community_of_inquiry_activity.php
index e79b297ccda90..367ae2ec92675 100644
--- a/analytics/classes/local/indicator/community_of_inquiry_activity.php
+++ b/analytics/classes/local/indicator/community_of_inquiry_activity.php
@@ -35,10 +35,12 @@
  */
 abstract class community_of_inquiry_activity extends linear {
 
+    /**
+     * @var \core_analytics\course
+     */
     protected $course = null;
+
     /**
-     * TODO This should ideally be reused by cognitive depth and social breadth.
-     *
      * @var array Array of logs by [contextid][userid]
      */
     protected $activitylogs = null;
@@ -49,12 +51,12 @@ abstract class community_of_inquiry_activity extends linear {
     protected $grades = null;
 
     /**
-     * @const Constant cognitive indicator type.
+     * Constant cognitive indicator type.
      */
     const INDICATOR_COGNITIVE = "cognitve";
 
     /**
-     * @const Constant social indicator type.
+     * Constant social indicator type.
      */
     const INDICATOR_SOCIAL = "social";
 
@@ -63,7 +65,7 @@ abstract class community_of_inquiry_activity extends linear {
      *
      * @var string The activity name (e.g. assign or quiz)
      */
-    final protected function get_activity_type() {
+    protected final function get_activity_type() {
         $class = get_class($this);
         $package = stristr($class, "\\", true);
         $type = str_replace("mod_", "", $package);
@@ -73,21 +75,47 @@ final protected function get_activity_type() {
         return $type;
     }
 
+    /**
+     * Returns the potential level of cognitive depth.
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_cognitive_depth_level(\cm_info $cm) {
         throw new \coding_exception('Overwrite get_cognitive_depth_level method to set your activity potential cognitive ' .
             'depth level');
     }
 
+    /**
+     * Returns the potential level of social breadth.
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         throw new \coding_exception('Overwrite get_social_breadth_level method to set your activity potential social ' .
             'breadth level');
     }
 
+    /**
+     * required_sample_data
+     *
+     * @return string[]
+     */
     public static function required_sample_data() {
         // Only course because the indicator is valid even without students.
         return array('course');
     }
 
+    /**
+     * Do activity logs contain any log of user in this context?
+     *
+     * If user is empty we look for any log in this context.
+     *
+     * @param int $contextid
+     * @param \stdClass|false $user
+     * @return bool
+     */
     protected final function any_log($contextid, $user) {
         if (empty($this->activitylogs[$contextid])) {
             return false;
@@ -103,6 +131,15 @@ protected final function any_log($contextid, $user) {
         return false;
     }
 
+    /**
+     * Do activity logs contain any write log of user in this context?
+     *
+     * If user is empty we look for any write log in this context.
+     *
+     * @param int $contextid
+     * @param \stdClass|false $user
+     * @return bool
+     */
     protected final function any_write_log($contextid, $user) {
         if (empty($this->activitylogs[$contextid])) {
             return false;
@@ -127,6 +164,17 @@ protected final function any_write_log($contextid, $user) {
         return false;
     }
 
+    /**
+     * Is there any feedback activity log for this user in this context?
+     *
+     * This method returns true if $user is empty and there is any feedback activity logs.
+     *
+     * @param string $action
+     * @param \cm_info $cm
+     * @param int $contextid
+     * @param \stdClass|false $user
+     * @return bool
+     */
     protected function any_feedback($action, \cm_info $cm, $contextid, $user) {
 
         if (!in_array($action, 'submitted', 'replied', 'viewed')) {
@@ -175,29 +223,76 @@ protected function feedback_viewed(\cm_info $cm, $contextid, $userid, $after = n
         return $this->feedback_post_action($cm, $contextid, $userid, $this->feedback_viewed_events(), $after);
     }
 
+    /**
+     * $cm is used for this method overrides.
+     *
+     * This function must be fast.
+     *
+     * @param \cm_info $cm
+     * @param mixed $contextid
+     * @param mixed $userid
+     * @param int $after Timestamp, defaults to the graded date or false if we don't check the date.
+     * @return bool
+     */
     protected function feedback_replied(\cm_info $cm, $contextid, $userid, $after = null) {
         return $this->feedback_post_action($cm, $contextid, $userid, $this->feedback_replied_events(), $after);
     }
 
+    /**
+     * $cm is used for this method overrides.
+     *
+     * This function must be fast.
+     *
+     * @param \cm_info $cm
+     * @param mixed $contextid
+     * @param mixed $userid
+     * @param int $after Timestamp, defaults to the graded date or false if we don't check the date.
+     * @return bool
+     */
     protected function feedback_submitted(\cm_info $cm, $contextid, $userid, $after = null) {
         return $this->feedback_post_action($cm, $contextid, $userid, $this->feedback_submitted_events(), $after);
     }
 
+    /**
+     * Returns the list of events that involve viewing feedback from other users.
+     *
+     * @return string[]
+     */
     protected function feedback_viewed_events() {
         throw new \coding_exception('Activities with a potential cognitive or social level that include viewing feedback ' .
             'should define "feedback_viewed_events" method or should override feedback_viewed method.');
     }
 
+    /**
+     * Returns the list of events that involve replying to feedback from other users.
+     *
+     * @return string[]
+     */
     protected function feedback_replied_events() {
         throw new \coding_exception('Activities with a potential cognitive or social level that include replying to feedback ' .
             'should define "feedback_replied_events" method or should override feedback_replied method.');
     }
 
+    /**
+     * Returns the list of events that involve submitting something after receiving feedback from other users.
+     *
+     * @return string[]
+     */
     protected function feedback_submitted_events() {
         throw new \coding_exception('Activities with a potential cognitive or social level that include viewing feedback ' .
             'should define "feedback_submitted_events" method or should override feedback_submitted method.');
     }
 
+    /**
+     * Whether this user in this context did any of the provided actions (events)
+     *
+     * @param \cm_info $cm
+     * @param int $contextid
+     * @param int $userid
+     * @param string[] $eventnames
+     * @param int|false $after
+     * @return bool
+     */
     protected function feedback_post_action(\cm_info $cm, $contextid, $userid, $eventnames, $after = null) {
         if ($after === null) {
             if ($this->feedback_check_grades()) {
@@ -237,7 +332,7 @@ protected function feedback_post_action(\cm_info $cm, $contextid, $userid, $even
     }
 
     /**
-     * get_graded_date
+     * Returns the date a user was graded.
      *
      * @param int $contextid
      * @param int $userid
@@ -268,6 +363,15 @@ protected function get_graded_date($contextid, $userid, $checkfeedback = false)
         return $after;
     }
 
+    /**
+     * Returns the activities the user had access to between a time period.
+     *
+     * @param int $sampleid
+     * @param string $tablename
+     * @param int $starttime
+     * @param int $endtime
+     * @return array
+     */
     protected function get_student_activities($sampleid, $tablename, $starttime, $endtime) {
 
         // May not be available.
@@ -307,6 +411,14 @@ protected function get_student_activities($sampleid, $tablename, $starttime, $en
         return $useractivities;
     }
 
+    /**
+     * Fetch acitivity logs from database
+     *
+     * @param array $activities
+     * @param int $starttime
+     * @param int $endtime
+     * @return array
+     */
     protected function fetch_activity_logs($activities, $starttime = false, $endtime = false) {
         global $DB;
 
@@ -330,7 +442,7 @@ protected function fetch_activity_logs($activities, $starttime = false, $endtime
                 $processedevents[$event->contextid][$event->userid] = array();
             }
 
-            // contextid and userid have already been used to index the events, the next field to index by is eventname:
+            // Contextid and userid have already been used to index the events, the next field to index by is eventname:
             // crud is unique per eventname, courseid is the same for all records and we append timecreated.
             if (!isset($processedevents[$event->contextid][$event->userid][$event->eventname])) {
 
@@ -358,7 +470,7 @@ protected function fetch_activity_logs($activities, $starttime = false, $endtime
     /**
      * Whether grades should be checked or not when looking for feedback.
      *
-     * @return void
+     * @return bool
      */
     protected function feedback_check_grades() {
         return true;
@@ -367,10 +479,10 @@ protected function feedback_check_grades() {
     /**
      * cognitive_calculate_sample
      *
-     * @param $sampleid
-     * @param $tablename
-     * @param bool $starttime
-     * @param bool $endtime
+     * @param int $sampleid
+     * @param string $tablename
+     * @param int $starttime
+     * @param int $endtime
      * @return float|int|null
      * @throws \coding_exception
      */
@@ -404,7 +516,7 @@ protected function cognitive_calculate_sample($sampleid, $tablename, $starttime
                         $score += $scoreperlevel * 5;
                         break;
                     }
-                // The user didn't reach the activity max cognitive depth, continue with level 2.
+                    // The user didn't reach the activity max cognitive depth, continue with level 2.
 
                 case 4:
                     // Cognitive level 4 is to comment on feedback.
@@ -412,7 +524,7 @@ protected function cognitive_calculate_sample($sampleid, $tablename, $starttime
                         $score += $scoreperlevel * 4;
                         break;
                     }
-                // The user didn't reach the activity max cognitive depth, continue with level 2.
+                    // The user didn't reach the activity max cognitive depth, continue with level 2.
 
                 case 3:
                     // Cognitive level 3 is to view feedback.
@@ -422,7 +534,7 @@ protected function cognitive_calculate_sample($sampleid, $tablename, $starttime
                         $score += $scoreperlevel * 3;
                         break;
                     }
-                // The user didn't reach the activity max cognitive depth, continue with level 2.
+                    // The user didn't reach the activity max cognitive depth, continue with level 2.
 
                 case 2:
                     // Cognitive depth level 2 is to submit content.
@@ -431,7 +543,7 @@ protected function cognitive_calculate_sample($sampleid, $tablename, $starttime
                         $score += $scoreperlevel * 2;
                         break;
                     }
-                // The user didn't reach the activity max cognitive depth, continue with level 1.
+                    // The user didn't reach the activity max cognitive depth, continue with level 1.
 
                 case 1:
                     // Cognitive depth level 1 is just accessing the activity.
@@ -456,10 +568,10 @@ protected function cognitive_calculate_sample($sampleid, $tablename, $starttime
     /**
      * social_calculate_sample
      *
-     * @param $sampleid
-     * @param $tablename
-     * @param bool $starttime
-     * @param bool $endtime
+     * @param int $sampleid
+     * @param string $tablename
+     * @param int $starttime
+     * @param int $endtime
      * @return float|int|null
      */
     protected function social_calculate_sample($sampleid, $tablename, $starttime = false, $endtime = false) {
@@ -486,14 +598,15 @@ protected function social_calculate_sample($sampleid, $tablename, $starttime = f
             // TODO Add support for other levels than 2.
             switch ($potentiallevel) {
                 case 2:
-                    // Social breadth level 2 is to view feedback. (Same as cognitive level 3)
+                    // Social breadth level 2 is to view feedback. (Same as cognitive level 3).
 
                     if ($this->any_feedback('viewed', $cm, $contextid, $user)) {
                         // Max score for level 2.
                         $score += $scoreperlevel * 2;
                         break;
                     }
-                // The user didn't reach the activity max social breadth, continue with level 1.
+                    // The user didn't reach the activity max social breadth, continue with level 1.
+
                 case 1:
                     // Social breadth level 1 is just accessing the activity.
                     if ($this->any_log($contextid, $user)) {
@@ -515,12 +628,12 @@ protected function social_calculate_sample($sampleid, $tablename, $starttime = f
     /**
      * calculate_sample
      *
+     * @throws \coding_exception
      * @param int $sampleid
      * @param string $tablename
-     * @param bool $starttime
-     * @param bool $endtime
+     * @param int $starttime
+     * @param int $endtime
      * @return float|int|null
-     * @throws \coding_exception
      */
     protected function calculate_sample($sampleid, $tablename, $starttime = false, $endtime = false) {
         if ($this->get_indicator_type() == self::INDICATOR_COGNITIVE) {
@@ -534,7 +647,7 @@ protected function calculate_sample($sampleid, $tablename, $starttime = false, $
     /**
      * Defines indicator type.
      *
-     * @return mixed
+     * @return string
      */
     abstract protected function get_indicator_type();
 }
diff --git a/analytics/classes/local/indicator/discrete.php b/analytics/classes/local/indicator/discrete.php
index 7f63e9104f9f6..a557fb40c4a1d 100644
--- a/analytics/classes/local/indicator/discrete.php
+++ b/analytics/classes/local/indicator/discrete.php
@@ -44,6 +44,11 @@ protected static function get_classes() {
         throw new \coding_exception('Please overwrite get_classes() specifying your discrete-values\' indicator classes');
     }
 
+    /**
+     * Returns 1 feature header for each of the classes.
+     *
+     * @return string[]
+     */
     public static function get_feature_headers() {
         $fullclassname = get_called_class();
 
@@ -55,6 +60,13 @@ public static function get_feature_headers() {
         return $headers;
     }
 
+    /**
+     * Whether the value should be displayed or not.
+     *
+     * @param float $value
+     * @param string $subtype
+     * @return bool
+     */
     public function should_be_displayed($value, $subtype) {
         if ($value != static::get_max_value()) {
             // Discrete values indicators are converted internally to 1 feature per indicator, we are only interested
@@ -94,6 +106,14 @@ public function get_display_style($ignoredvalue, $ignoredsubtype) {
         return \core_analytics\calculable::OUTCOME_NEUTRAL;
     }
 
+    /**
+     * From calculated values to dataset features.
+     *
+     * One column for each class.
+     *
+     * @param float[] $calculatedvalues
+     * @return float[]
+     */
     protected function to_features($calculatedvalues) {
 
         $classes = self::get_classes();
diff --git a/analytics/classes/local/indicator/linear.php b/analytics/classes/local/indicator/linear.php
index bdc9f6f6909f8..df2f646742cf7 100644
--- a/analytics/classes/local/indicator/linear.php
+++ b/analytics/classes/local/indicator/linear.php
@@ -44,6 +44,11 @@ protected static function include_averages() {
         return true;
     }
 
+    /**
+     * get_feature_headers
+     *
+     * @return array
+     */
     public static function get_feature_headers() {
 
         $fullclassname = get_called_class();
@@ -57,6 +62,13 @@ public static function get_feature_headers() {
         return $headers;
     }
 
+    /**
+     * should_be_displayed
+     *
+     * @param float $value
+     * @param string $subtype
+     * @return bool
+     */
     public function should_be_displayed($value, $subtype) {
         if ($subtype != false) {
             return false;
@@ -91,6 +103,12 @@ public function get_calculation_outcome($value, $subtype = false) {
         }
     }
 
+    /**
+     * Converts the calculated values to a list of features for the dataset.
+     *
+     * @param array $calculatedvalues
+     * @return array
+     */
     protected function to_features($calculatedvalues) {
 
         // Null mean if all calculated values are null.
diff --git a/analytics/classes/local/indicator/read_actions.php b/analytics/classes/local/indicator/read_actions.php
index 825b155d2baba..1d6099f019131 100644
--- a/analytics/classes/local/indicator/read_actions.php
+++ b/analytics/classes/local/indicator/read_actions.php
@@ -35,15 +35,34 @@
  */
 class read_actions extends linear {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:readactions', 'analytics');
     }
 
+    /**
+     * required_sample_data
+     *
+     * @return string[]
+     */
     public static function required_sample_data() {
         // User is not required, calculate_sample can handle its absence.
         return array('context');
     }
 
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param string $sampleorigin
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
     protected function calculate_sample($sampleid, $sampleorigin, $starttime = false, $endtime = false) {
 
         $select = '';
@@ -67,7 +86,7 @@ protected function calculate_sample($sampleid, $sampleorigin, $starttime = false
         // # Done absolutely nothing
         // # Not much really, just accessing the course once a week
         // # More than just accessing the course, some interaction
-        // # Significant contribution, will depend on the course anyway
+        // # Significant contribution, will depend on the course anyway.
 
         // We need to adapt the limits to the time range duration.
         $nweeks = $this->get_time_range_weeks_number($starttime, $endtime);
diff --git a/analytics/classes/local/indicator/user_profile_set.php b/analytics/classes/local/indicator/user_profile_set.php
index b55c92e7d3bf9..3a2ad7c4f996f 100644
--- a/analytics/classes/local/indicator/user_profile_set.php
+++ b/analytics/classes/local/indicator/user_profile_set.php
@@ -35,15 +35,33 @@
  */
 class user_profile_set extends linear {
 
-
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:completeduserprofile', 'analytics');
     }
 
+    /**
+     * required_sample_data
+     *
+     * @return string[]
+     */
     public static function required_sample_data() {
         return array('user');
     }
 
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param string $sampleorigin
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
     protected function calculate_sample($sampleid, $sampleorigin, $starttime = false, $endtime = false) {
         global $CFG;
 
diff --git a/analytics/classes/local/indicator/user_track_forums.php b/analytics/classes/local/indicator/user_track_forums.php
index 07702cd0ece73..4d1daa84b4b74 100644
--- a/analytics/classes/local/indicator/user_track_forums.php
+++ b/analytics/classes/local/indicator/user_track_forums.php
@@ -35,14 +35,33 @@
  */
 class user_track_forums extends binary {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:userforumstracking', 'analytics');
     }
 
+    /**
+     * required_sample_data
+     *
+     * @return string[]
+     */
     public static function required_sample_data() {
         return array('user');
     }
 
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param string $samplesorigin
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
     protected function calculate_sample($sampleid, $samplesorigin, $starttime = false, $endtime = false) {
         $user = $this->retrieve('user', $sampleid);
         return ($user->trackforums) ? self::get_max_value() : self::get_min_value();
diff --git a/analytics/classes/local/target/base.php b/analytics/classes/local/target/base.php
index d25f05f0b6360..8144220b5a876 100644
--- a/analytics/classes/local/target/base.php
+++ b/analytics/classes/local/target/base.php
@@ -186,7 +186,6 @@ public function generate_insight_notifications($modelid, $samplecontexts) {
                 $message->smallmessage = get_string('insightinfomessage', 'analytics', $insighturl->out());
                 $message->contexturl = $insighturl->out(false);
 
-
                 message_send($message);
             }
         }
@@ -240,7 +239,7 @@ protected function min_prediction_score() {
      * Should the model callback be triggered?
      *
      * @param mixed $predictedvalue
-     * @param float $predictedscore
+     * @param float $predictionscore
      * @return bool
      */
     public function triggers_callback($predictedvalue, $predictionscore) {
@@ -292,7 +291,8 @@ public function calculate($sampleids, \core_analytics\analysable $analysable, $s
             $calculatedvalue = $this->calculate_sample($sampleid, $analysable, $starttime, $endtime);
 
             if (!is_null($calculatedvalue)) {
-                if ($this->is_linear() && ($calculatedvalue > static::get_max_value() || $calculatedvalue < static::get_min_value())) {
+                if ($this->is_linear() &&
+                        ($calculatedvalue > static::get_max_value() || $calculatedvalue < static::get_min_value())) {
                     throw new \coding_exception('Calculated values should be higher than ' . static::get_min_value() .
                         ' and lower than ' . static::get_max_value() . '. ' . $calculatedvalue . ' received');
                 } else if (!$this->is_linear() && static::is_a_class($calculatedvalue) === false) {
@@ -310,6 +310,7 @@ public function calculate($sampleids, \core_analytics\analysable $analysable, $s
      *
      * @param int[] $sampleids
      * @param \core_analytics\analysable $analysable
+     * @param bool $fortraining
      * @return void
      */
     public function filter_out_invalid_samples(&$sampleids, \core_analytics\analysable $analysable, $fortraining = true) {
diff --git a/analytics/classes/local/target/binary.php b/analytics/classes/local/target/binary.php
index 055e28d0148de..ea04410f3dfda 100644
--- a/analytics/classes/local/target/binary.php
+++ b/analytics/classes/local/target/binary.php
@@ -35,9 +35,12 @@
  */
 abstract class binary extends discrete {
 
+    /**
+     * is_linear
+     *
+     * @return bool
+     */
     public function is_linear() {
-        // TODO Remove this discrete override once prediction processors support
-        // multiclass classifiers; this method will be moved to discrete.
         return false;
     }
 
@@ -62,6 +65,13 @@ protected function ignored_predicted_classes() {
         return array(0);
     }
 
+    /**
+     * Is the calculated value a positive outcome of this target?
+     *
+     * @param string $value
+     * @param string $ignoredsubtype
+     * @return int
+     */
     public function get_calculation_outcome($value, $ignoredsubtype = false) {
 
         if (!self::is_a_class($value)) {
@@ -81,6 +91,11 @@ public function get_calculation_outcome($value, $ignoredsubtype = false) {
         return self::OUTCOME_VERY_POSITIVE;
     }
 
+    /**
+     * classes_description
+     *
+     * @return string[]
+     */
     protected static function classes_description() {
         return array(
             get_string('yes'),
diff --git a/analytics/classes/local/target/discrete.php b/analytics/classes/local/target/discrete.php
index e05b673d83565..5d3dcb4a878dd 100644
--- a/analytics/classes/local/target/discrete.php
+++ b/analytics/classes/local/target/discrete.php
@@ -35,11 +35,22 @@
  */
 abstract class discrete extends base {
 
+    /**
+     * Are this target calculations linear values?
+     *
+     * @return bool
+     */
     public function is_linear() {
         // Not supported yet.
         throw new \coding_exception('Sorry, this version\'s prediction processors only support targets with binary values.');
     }
 
+    /**
+     * Is the provided class one of this target valid classes?
+     *
+     * @param string $class
+     * @return bool
+     */
     protected static function is_a_class($class) {
         return (in_array($class, static::get_classes()));
     }
@@ -48,7 +59,7 @@ protected static function is_a_class($class) {
      * get_display_value
      *
      * @param float $value
-     * @param string $subtype
+     * @param string $ignoredsubtype
      * @return string
      */
     public function get_display_value($value, $ignoredsubtype = false) {
@@ -57,17 +68,19 @@ public function get_display_value($value, $ignoredsubtype = false) {
             throw new \moodle_exception('errorpredictionformat', 'analytics');
         }
 
-        // array_values to discard any possible weird keys devs used.
+        // To discard any possible weird keys devs used.
         $classes = array_values(static::get_classes());
         $descriptions = array_values(static::classes_description());
 
         if (count($classes) !== count($descriptions)) {
-            throw new \coding_exception('You need to describe all your classes (' . json_encode($classes) . ') in self::classes_description');
+            throw new \coding_exception('You need to describe all your classes (' . json_encode($classes) .
+                ') in self::classes_description');
         }
 
         $key = array_search($value, $classes);
         if ($key === false) {
-            throw new \coding_exception('You need to describe all your classes (' . json_encode($classes) . ') in self::classes_description');
+            throw new \coding_exception('You need to describe all your classes (' . json_encode($classes) .
+                ') in self::classes_description');
         }
 
         return $descriptions[$key];
@@ -91,8 +104,8 @@ public function get_calculation_outcome($value, $ignoredsubtype = false) {
             return self::OUTCOME_OK;
         }
 
-        debugging('Please overwrite \core_analytics\local\target\discrete::get_calculation_outcome, all your target classes are styled ' .
-            'the same way otherwise', DEBUG_DEVELOPER);
+        debugging('Please overwrite \core_analytics\local\target\discrete::get_calculation_outcome, all your target ' .
+            'classes are styled the same way otherwise', DEBUG_DEVELOPER);
         return self::OUTCOME_OK;
     }
 
diff --git a/analytics/classes/local/target/linear.php b/analytics/classes/local/target/linear.php
index 76b6ea75f1562..8d8e258fe7d68 100644
--- a/analytics/classes/local/target/linear.php
+++ b/analytics/classes/local/target/linear.php
@@ -35,11 +35,23 @@
  */
 abstract class linear extends base {
 
+    /**
+     * Are the calculated values this target returns linear values?
+     *
+     * @return bool
+     */
     public function is_linear() {
         // Not supported yet.
         throw new \coding_exception('Sorry, this version\'s prediction processors only support targets with binary values.');
     }
 
+    /**
+     * How positive is this calculated value?
+     *
+     * @param float $value
+     * @param string $ignoredsubtype
+     * @return int
+     */
     public function get_calculated_outcome($value, $ignoredsubtype = false) {
 
         // This is very generic, targets will probably be interested in overwriting this.
diff --git a/analytics/classes/local/time_splitting/base.php b/analytics/classes/local/time_splitting/base.php
index a828d1466d921..4992799eb5d86 100644
--- a/analytics/classes/local/time_splitting/base.php
+++ b/analytics/classes/local/time_splitting/base.php
@@ -26,6 +26,13 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+/**
+ * Base time splitting method.
+ *
+ * @package   core_analytics
+ * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 abstract class base {
 
     /**
@@ -59,8 +66,22 @@ abstract class base {
      */
     protected static $indicators = [];
 
+    /**
+     * Define the time splitting methods ranges.
+     *
+     * 'time' value defines when predictions are executed, their values will be compared with
+     * the current time in ready_to_predict
+     *
+     * @return array('start' => time(), 'end' => time(), 'time' => time())
+     */
     abstract protected function define_ranges();
 
+    /**
+     * The time splitting method name.
+     *
+     * It is very recommendable to overwrite this method as this name appears in the UI.
+     * @return string
+     */
     public function get_name() {
         return $this->get_id();
     }
@@ -86,6 +107,11 @@ public function set_analysable(\core_analytics\analysable $analysable) {
         $this->validate_ranges();
     }
 
+    /**
+     * get_analysable
+     *
+     * @return \core_analytics\analysable
+     */
     public function get_analysable() {
         return $this->analysable;
     }
@@ -93,12 +119,19 @@ public function get_analysable() {
     /**
      * Returns whether the course can be processed by this time splitting method or not.
      *
+     * @param \core_analytics\analysable $analysable
      * @return bool
      */
     public function is_valid_analysable(\core_analytics\analysable $analysable) {
         return true;
     }
 
+    /**
+     * Should we predict this time range now?
+     *
+     * @param array $range
+     * @return bool
+     */
     public function ready_to_predict($range) {
         if ($range['time'] <= time()) {
             return true;
@@ -111,7 +144,7 @@ public function ready_to_predict($range) {
      *
      * @param array $sampleids
      * @param string $samplesorigin
-     * @param \core_analytics\local\indicator\base $indicators
+     * @param \core_analytics\local\indicator\base[] $indicators
      * @param array $ranges
      * @param \core_analytics\local\target\base $target
      * @return array
@@ -155,6 +188,10 @@ public function calculate(&$sampleids, $samplesorigin, $indicators, $ranges, $ta
     /**
      * Calculates indicators.
      *
+     * @param array $sampleids
+     * @param string $samplesorigin
+     * @param \core_analytics\local\indicator\base[] $indicators
+     * @param array $ranges
      * @return array
      */
     protected function calculate_indicators($sampleids, $samplesorigin, $indicators, $ranges) {
@@ -197,6 +234,8 @@ protected function calculate_indicators($sampleids, $samplesorigin, $indicators,
      *
      * This will identify the sample as belonging to a specific range.
      *
+     * @param array $dataset
+     * @param array $calculatedtarget
      * @return void
      */
     protected function fill_dataset(&$dataset, $calculatedtarget = false) {
@@ -244,6 +283,9 @@ protected function fill_dataset(&$dataset, $calculatedtarget = false) {
      * .....
      * ----------------------------------------------------
      *
+     * @param array $dataset
+     * @param \core_analytics\local\indicator\base[] $indicators
+     * @param \core_analytics\local\target\base|false $target
      * @return void
      */
     protected function add_metadata(&$dataset, $indicators, $target = false) {
@@ -284,6 +326,7 @@ public function get_all_ranges() {
     /**
      * get_range_by_index
      *
+     * @param int $rangeindex
      * @return array
      */
     public function get_range_by_index($rangeindex) {
@@ -293,14 +336,34 @@ public function get_range_by_index($rangeindex) {
         return $this->ranges[$rangeindex];
     }
 
+    /**
+     * Generates a unique sample id (sample in a range index).
+     *
+     * @param int $sampleid
+     * @param int $rangeindex
+     * @return string
+     */
     public function append_rangeindex($sampleid, $rangeindex) {
         return $sampleid . '-' . $rangeindex;
     }
 
-    public function infer_sample_info($sampleid) {
-        return explode('-', $sampleid);
+    /**
+     * Returns the sample id and the range index from a uniquesampleid.
+     *
+     * @param string $uniquesampleid
+     * @return array array($sampleid, $rangeindex)
+     */
+    public function infer_sample_info($uniquesampleid) {
+        return explode('-', $uniquesampleid);
     }
 
+    /**
+     * Returns the headers for the csv file based on the indicators and the target.
+     *
+     * @param \core_analytics\local\indicator\base[] $indicators
+     * @param \core_analytics\local\target\base|false $target
+     * @return string[]
+     */
     protected function get_headers($indicators, $target = false) {
         // 3rd column will contain the indicator ids.
         $headers = array();
@@ -335,7 +398,7 @@ protected function get_headers($indicators, $target = false) {
     /**
      * Validates the time splitting method ranges.
      *
-     * @throw \coding_exception
+     * @throws \coding_exception
      * @return void
      */
     protected function validate_ranges() {
diff --git a/analytics/classes/local/time_splitting/deciles.php b/analytics/classes/local/time_splitting/deciles.php
index bf6c3eb9c4cd5..dbfca557c2985 100644
--- a/analytics/classes/local/time_splitting/deciles.php
+++ b/analytics/classes/local/time_splitting/deciles.php
@@ -35,10 +35,20 @@
  */
 class deciles extends base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public function get_name() {
         return get_string('timesplitting:deciles', 'analytics');
     }
 
+    /**
+     * define_ranges
+     *
+     * @return array
+     */
     protected function define_ranges() {
         $rangeduration = floor(($this->analysable->get_end() - $this->analysable->get_start()) / 10);
 
diff --git a/analytics/classes/local/time_splitting/deciles_accum.php b/analytics/classes/local/time_splitting/deciles_accum.php
index ff9340fe681d5..486be855334a0 100644
--- a/analytics/classes/local/time_splitting/deciles_accum.php
+++ b/analytics/classes/local/time_splitting/deciles_accum.php
@@ -35,10 +35,20 @@
  */
 class deciles_accum extends base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public function get_name() {
         return get_string('timesplitting:decilesaccum', 'analytics');
     }
 
+    /**
+     * define_ranges
+     *
+     * @return array
+     */
     protected function define_ranges() {
         $rangeduration = floor(($this->analysable->get_end() - $this->analysable->get_start()) / 10);
 
diff --git a/analytics/classes/local/time_splitting/no_splitting.php b/analytics/classes/local/time_splitting/no_splitting.php
index 54a784ec6c97f..0252a584f9e05 100644
--- a/analytics/classes/local/time_splitting/no_splitting.php
+++ b/analytics/classes/local/time_splitting/no_splitting.php
@@ -28,16 +28,41 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+/**
+ * No time splitting method.
+ *
+ * Used when time is not a factor to consider into the equation.
+ *
+ * @package   core_analytics
+ * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 class no_splitting extends base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public function get_name() {
         return get_string('timesplitting:nosplitting', 'analytics');
     }
 
+    /**
+     * ready_to_predict
+     *
+     * @param array $range
+     * @return true
+     */
     public function ready_to_predict($range) {
         return true;
     }
 
+    /**
+     * define_ranges
+     *
+     * @return array
+     */
     protected function define_ranges() {
         return [
             [
diff --git a/analytics/classes/local/time_splitting/quarters.php b/analytics/classes/local/time_splitting/quarters.php
index 2307dacab233d..4ad1b5f36810c 100644
--- a/analytics/classes/local/time_splitting/quarters.php
+++ b/analytics/classes/local/time_splitting/quarters.php
@@ -35,10 +35,20 @@
  */
 class quarters extends base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public function get_name() {
         return get_string('timesplitting:quarters', 'analytics');
     }
 
+    /**
+     * define_ranges
+     *
+     * @return array
+     */
     protected function define_ranges() {
         $duration = floor(($this->analysable->get_end() - $this->analysable->get_start()) / 4);
         return [
diff --git a/analytics/classes/local/time_splitting/quarters_accum.php b/analytics/classes/local/time_splitting/quarters_accum.php
index a84d546b95d1a..6b7e0fc692b9e 100644
--- a/analytics/classes/local/time_splitting/quarters_accum.php
+++ b/analytics/classes/local/time_splitting/quarters_accum.php
@@ -35,10 +35,20 @@
  */
 class quarters_accum extends base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public function get_name() {
         return get_string('timesplitting:quartersaccum', 'analytics');
     }
 
+    /**
+     * define_ranges
+     *
+     * @return array
+     */
     protected function define_ranges() {
         $duration = floor(($this->analysable->get_end() - $this->analysable->get_start()) / 4);
         return [
diff --git a/analytics/classes/local/time_splitting/single_range.php b/analytics/classes/local/time_splitting/single_range.php
index cf55c946c8859..0386f27737e0d 100644
--- a/analytics/classes/local/time_splitting/single_range.php
+++ b/analytics/classes/local/time_splitting/single_range.php
@@ -26,14 +26,31 @@
 
 defined('MOODLE_INTERNAL') || die();
 
+/**
+ * Single time splitting method.
+ *
+ * @package   core_analytics
+ * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 class single_range extends base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public function get_name() {
         return get_string('timesplitting:singlerange', 'analytics');
     }
 
+    /**
+     * One single range covering all analysable duration.
+     *
+     * @return array
+     */
     protected function define_ranges() {
-        // time == 0 because we want it to start predicting from the beginning.
+        // Key 'time' == 0 because we want it to start predicting from the beginning.
         return [
             [
                 'start' => $this->analysable->get_start(),
diff --git a/analytics/classes/local/time_splitting/weekly.php b/analytics/classes/local/time_splitting/weekly.php
deleted file mode 100644
index 72d2dd81754e6..0000000000000
--- a/analytics/classes/local/time_splitting/weekly.php
+++ /dev/null
@@ -1,80 +0,0 @@
-<?php
-// This file is part of Moodle - http://moodle.org/
-//
-// Moodle is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// Moodle is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
-
-/**
- * Weekly time splitting method.
- *
- * @package   core_analytics
- * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
- * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-
-namespace core_analytics\local\time_splitting;
-
-defined('MOODLE_INTERNAL') || die();
-
-abstract class weekly extends base {
-
-    public function get_name() {
-        return get_string('timesplitting:weekly', 'analytics');
-    }
-
-    public function is_valid_analysable(\core_analytics\analysable $analysable) {
-        $diff = $analysable->get_end() - $analysable->get_start();
-        $nweeks = round($diff / WEEKSECS);
-        if ($nweeks > 520) {
-            // More than 10 years...
-            return get_string('coursetoolong', 'analytics');
-        }
-        return parent::is_valid_analysable($analysable);
-    }
-
-    protected function define_ranges() {
-
-        $ranges = array();
-
-        // It is more important to work with a proper end date than the start date.
-        $i = 0;
-        do {
-
-            $dt = new \DateTime();
-            $dt->setTimestamp($this->analysable->get_end());
-            $dt->modify('-' . $i . ' weeks');
-            $rangeend = $dt->getTimestamp();
-
-            $dt->modify('-1 weeks');
-            $rangestart = $dt->getTimestamp();
-
-            $ranges[] = array(
-                'start' => $rangestart,
-                'end' => $rangeend,
-                'time' => $rangeend
-            );
-
-            $i++;
-
-        } while ($this->analysable->get_start() < $rangestart);
-
-        $ranges = array_reverse($ranges, false);
-
-        // Is not worth trying to predict during the first weeks.
-        array_shift($ranges);
-        array_shift($ranges);
-
-        return $ranges;
-    }
-
-}
diff --git a/analytics/classes/local/time_splitting/weekly_accum.php b/analytics/classes/local/time_splitting/weekly_accum.php
deleted file mode 100644
index 99a0c49b852a3..0000000000000
--- a/analytics/classes/local/time_splitting/weekly_accum.php
+++ /dev/null
@@ -1,82 +0,0 @@
-<?php
-// This file is part of Moodle - http://moodle.org/
-//
-// Moodle is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// Moodle is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
-
-/**
- * Weekly time splitting method.
- *
- * @package   core_analytics
- * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
- * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
- */
-
-namespace core_analytics\local\time_splitting;
-
-defined('MOODLE_INTERNAL') || die();
-
-abstract class weekly_accum extends base {
-
-    public function get_name() {
-        return get_string('timesplitting:weeklyaccum', 'analytics');
-    }
-
-    public function is_valid_analysable(\core_analytics\analysable $analysable) {
-        $diff = $analysable->get_end() - $analysable->get_start();
-        $nweeks = round($diff / WEEKSECS);
-        if ($nweeks > 520) {
-            // More than 10 years...
-            return false;
-        }
-        return parent::is_valid_analysable($analysable);
-    }
-
-    protected function define_ranges() {
-
-        $ranges = array();
-
-        // It is more important to work with a proper end date than start date.
-        $i = 0;
-        do {
-
-            $dt = new \DateTime();
-            $dt->setTimestamp($this->analysable->get_end());
-            $dt->modify('-' . $i . ' weeks');
-            $rangeend = $dt->getTimestamp();
-
-            // Used to calculate when we are done creating new ranges.
-            $dt->modify('-1 weeks');
-            $rangestart = $dt->getTimestamp();
-
-            // Accumulative, always from the course start.
-            $ranges[] = array(
-                'start' => $this->analysable->get_start(),
-                'end' => $rangeend,
-                'time' => $rangeend
-            );
-
-            $i++;
-
-        } while ($this->analysable->get_start() < $rangestart);
-
-        $ranges = array_reverse($ranges, false);
-
-        // Is not worth trying to predict during the first weeks.
-        array_shift($ranges);
-        array_shift($ranges);
-
-        return $ranges;
-    }
-
-}
diff --git a/analytics/classes/manager.php b/analytics/classes/manager.php
index 5b158d4b8d772..02325a6b9d5ef 100644
--- a/analytics/classes/manager.php
+++ b/analytics/classes/manager.php
@@ -335,7 +335,7 @@ public static function get_models_with_insights(\context $context) {
 
         self::check_can_list_insights($context);
 
-        $models = \core_analytics\manager::get_all_models(true, true, $context);
+        $models = self::get_all_models(true, true, $context);
         foreach ($models as $key => $model) {
             // Check that it not only have predictions but also generates insights from them.
             if (!$model->uses_insights()) {
@@ -366,7 +366,7 @@ public static function get_prediction($predictionid, $requirelogin = false) {
             $context = \context::instance_by_id($predictionobj->contextid);
         }
 
-        \core_analytics\manager::check_can_list_insights($context);
+        self::check_can_list_insights($context);
 
         $model = new \core_analytics\model($predictionobj->modelid);
         $sampledata = $model->prediction_sample_data($predictionobj);
diff --git a/analytics/classes/model.php b/analytics/classes/model.php
index 6838644242648..f1e25ddcf0801 100644
--- a/analytics/classes/model.php
+++ b/analytics/classes/model.php
@@ -35,19 +35,59 @@
  */
 class model {
 
+    /**
+     * All as expected.
+     */
     const OK = 0;
+
+    /**
+     * There was a problem.
+     */
     const GENERAL_ERROR = 1;
+
+    /**
+     * No dataset to analyse.
+     */
     const NO_DATASET = 2;
 
+    /**
+     * Model with low prediction accuracy.
+     */
     const EVALUATE_LOW_SCORE = 4;
+
+    /**
+     * Not enough data to evaluate the model properly.
+     */
     const EVALUATE_NOT_ENOUGH_DATA = 8;
 
-    const ANALYSE_REJECTED_RANGE_PROCESSOR = 4;
+    /**
+     * Invalid analysable for the time splitting method.
+     */
+    const ANALYSABLE_REJECTED_TIME_SPLITTING_METHOD = 4;
+
+    /**
+     * Invalid analysable for all time splitting methods.
+     */
     const ANALYSABLE_STATUS_INVALID_FOR_RANGEPROCESSORS = 8;
+
+    /**
+     * Invalid analysable for the target
+     */
     const ANALYSABLE_STATUS_INVALID_FOR_TARGET = 16;
 
+    /**
+     * Minimum score to consider a non-static prediction model as good.
+     */
     const MIN_SCORE = 0.7;
+
+    /**
+     * Maximum standard deviation between different evaluation repetitions to consider that evaluation results are stable.
+     */
     const ACCEPTED_DEVIATION = 0.05;
+
+    /**
+     * Number of evaluation repetitions.
+     */
     const EVALUATION_ITERATIONS = 10;
 
     /**
@@ -552,7 +592,7 @@ public function predict() {
 
         if ($this->is_static()) {
             // Prediction based on assumptions.
-            $result->status = \core_analytics\model::OK;
+            $result->status = self::OK;
             $result->info = [];
             $result->predictions = $this->get_static_predictions($indicatorcalculations);
 
@@ -589,7 +629,7 @@ private function format_predictor_predictions($predictorresult) {
         if ($predictorresult->predictions) {
             foreach ($predictorresult->predictions as $sampleinfo) {
 
-                // We parse each prediction
+                // We parse each prediction.
                 switch (count($sampleinfo)) {
                     case 1:
                         // For whatever reason the predictions processor could not process this sample, we
@@ -620,7 +660,7 @@ private function format_predictor_predictions($predictorresult) {
      * Execute the prediction callbacks defined by the target.
      *
      * @param \stdClass[] $predictions
-     * @param array $predictions
+     * @param array $indicatorcalculations
      * @return array
      */
     protected function execute_prediction_callbacks($predictions, $indicatorcalculations) {
@@ -636,8 +676,8 @@ protected function execute_prediction_callbacks($predictions, $indicatorcalculat
                 list($sampleid, $rangeindex) = $this->get_time_splitting()->infer_sample_info($uniquesampleid);
 
                 // Store the predicted values.
-                $samplecontext = $this->save_prediction($sampleid, $rangeindex, $prediction->prediction, $prediction->predictionscore,
-                    json_encode($indicatorcalculations[$uniquesampleid]));
+                $samplecontext = $this->save_prediction($sampleid, $rangeindex, $prediction->prediction,
+                    $prediction->predictionscore, json_encode($indicatorcalculations[$uniquesampleid]));
 
                 // Also store all samples context to later generate insights or whatever action the target wants to perform.
                 $samplecontexts[$samplecontext->id] = $samplecontext;
diff --git a/analytics/classes/prediction.php b/analytics/classes/prediction.php
index d81c46566a2d5..f738f693dadec 100644
--- a/analytics/classes/prediction.php
+++ b/analytics/classes/prediction.php
@@ -15,6 +15,7 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
+ * Representation of a prediction.
  *
  * @package   core_analytics
  * @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
@@ -26,6 +27,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 /**
+ * Representation of a prediction.
  *
  * @package   core_analytics
  * @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
@@ -33,12 +35,28 @@
  */
 class prediction {
 
+    /**
+     * @var \stdClass
+     */
     private $prediction;
 
+    /**
+     * @var array
+     */
     private $sampledata;
 
+    /**
+     * @var array
+     */
     private $calculations = array();
 
+    /**
+     * Constructor
+     *
+     * @param \stdClass $prediction
+     * @param array $sampledata
+     * @return void
+     */
     public function __construct($prediction, $sampledata) {
         global $DB;
 
@@ -52,18 +70,38 @@ public function __construct($prediction, $sampledata) {
         $this->format_calculations();
     }
 
+    /**
+     * Get prediction object data.
+     *
+     * @return \stdClass
+     */
     public function get_prediction_data() {
         return $this->prediction;
     }
 
+    /**
+     * Get prediction sample data.
+     *
+     * @return array
+     */
     public function get_sample_data() {
         return $this->sampledata;
     }
 
+    /**
+     * Gets the prediction calculations
+     *
+     * @return array
+     */
     public function get_calculations() {
         return $this->calculations;
     }
 
+    /**
+     * format_calculations
+     *
+     * @return \stdClass[]
+     */
     private function format_calculations() {
 
         $calculations = json_decode($this->prediction->calculations, true);
@@ -86,6 +124,12 @@ private function format_calculations() {
         }
     }
 
+    /**
+     * parse_feature_name
+     *
+     * @param string $featurename
+     * @return string[]
+     */
     private function parse_feature_name($featurename) {
 
         $indicatorclass = $featurename;
@@ -100,5 +144,4 @@ private function parse_feature_name($featurename) {
 
         return array($indicatorclass, $subtype);
     }
-
 }
diff --git a/analytics/classes/prediction_action.php b/analytics/classes/prediction_action.php
index 6a6e9ca365af2..db7e50ab46abf 100644
--- a/analytics/classes/prediction_action.php
+++ b/analytics/classes/prediction_action.php
@@ -15,6 +15,7 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
+ * Representation of a suggested action associated with a prediction.
  *
  * @package   core_analytics
  * @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
@@ -26,6 +27,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 /**
+ * Representation of a suggested action associated with a prediction.
  *
  * @package   core_analytics
  * @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
@@ -52,7 +54,8 @@ class prediction_action {
     public function __construct($actionname, \core_analytics\prediction $prediction, \moodle_url $actionurl, \pix_icon $icon, $text, $primary = false) {
 
         // We want to track how effective are our suggested actions, we pass users through a script that will log these actions.
-        $params = array('action' => $actionname, 'predictionid' => $prediction->get_prediction_data()->id, 'forwardurl' => $actionurl->out(false));
+        $params = array('action' => $actionname, 'predictionid' => $prediction->get_prediction_data()->id,
+            'forwardurl' => $actionurl->out(false));
         $url = new \moodle_url('/report/insights/action.php', $params);
 
         if ($primary === false) {
@@ -63,6 +66,8 @@ public function __construct($actionname, \core_analytics\prediction $prediction,
     }
 
     /**
+     * Returns the link to the action.
+     *
      * @return \action_menu_link
      */
     public function get_action_link() {
diff --git a/analytics/classes/predictor.php b/analytics/classes/predictor.php
index ed46ec3ea4e8d..944c76eeb2d50 100644
--- a/analytics/classes/predictor.php
+++ b/analytics/classes/predictor.php
@@ -35,11 +35,42 @@
  */
 interface predictor {
 
+    /**
+     * Is it ready to predict?
+     *
+     * @return bool
+     */
     public function is_ready();
 
+    /**
+     * Train the provided dataset.
+     *
+     * @param int $modelid
+     * @param \stored_file $dataset
+     * @param string $outputdir
+     * @return \stdClass
+     */
     public function train($modelid, \stored_file $dataset, $outputdir);
 
+    /**
+     * Predict the provided dataset samples.
+     *
+     * @param int $modelid
+     * @param \stored_file $dataset
+     * @param string $outputdir
+     * @return \stdClass
+     */
     public function predict($modelid, \stored_file $dataset, $outputdir);
 
+    /**
+     * evaluate
+     *
+     * @param int $modelid
+     * @param float $maxdeviation
+     * @param int $niterations
+     * @param \stored_file $dataset
+     * @param string $outputdir
+     * @return \stdClass
+     */
     public function evaluate($modelid, $maxdeviation, $niterations, \stored_file $dataset, $outputdir);
 }
diff --git a/analytics/classes/site.php b/analytics/classes/site.php
index f8a8396ff2953..e84c00a10432e 100644
--- a/analytics/classes/site.php
+++ b/analytics/classes/site.php
@@ -15,6 +15,7 @@
 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
 /**
+ * Moodle site analysable.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
@@ -26,6 +27,7 @@
 defined('MOODLE_INTERNAL') || die();
 
 /**
+ * Moodle site analysable.
  *
  * @package   core_analytics
  * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
diff --git a/analytics/tests/course_activities_test.php b/analytics/tests/course_activities_test.php
index 2d70b1b9e68d1..8ba3a34b067c0 100644
--- a/analytics/tests/course_activities_test.php
+++ b/analytics/tests/course_activities_test.php
@@ -33,6 +33,11 @@
  */
 class core_analytics_course_activities_testcase extends advanced_testcase {
 
+    /**
+     * availability_levels
+     *
+     * @return array
+     */
     public function availability_levels() {
         return array(
             'activity' => array('activity'),
@@ -51,7 +56,7 @@ public function test_get_activities_with_availability($availabilitylevel) {
 
         list($course, $stu1) = $this->setup_course();
 
-        // forum1 is ignored as section 0 does not count.
+        // Forum1 is ignored as section 0 does not count.
         $forum = $this->getDataGenerator()->create_module('forum', array('course' => $course->id));
 
         $courseman = new \core_analytics\course($course);
@@ -89,18 +94,27 @@ public function test_get_activities_with_availability($availabilitylevel) {
         $cm = $modinfo->get_cm($forum->cmid);
 
         // Condition from after provided end time.
-        $this->assertCount(0, $courseman->get_activities('forum', strtotime('2015-10-20 00:00:00 GMT'), strtotime('2015-10-21 00:00:00 GMT'), $stu1));
+        $this->assertCount(0, $courseman->get_activities('forum', strtotime('2015-10-20 00:00:00 GMT'),
+            strtotime('2015-10-21 00:00:00 GMT'), $stu1));
 
         // Condition until before provided start time
-        $this->assertCount(0, $courseman->get_activities('forum', strtotime('2015-10-25 00:00:00 GMT'), strtotime('2015-10-26 00:00:00 GMT'), $stu1));
+        $this->assertCount(0, $courseman->get_activities('forum', strtotime('2015-10-25 00:00:00 GMT'),
+            strtotime('2015-10-26 00:00:00 GMT'), $stu1));
 
         // Condition until after provided end time.
-        $this->assertCount(0, $courseman->get_activities('forum', strtotime('2015-10-22 00:00:00 GMT'), strtotime('2015-10-23 00:00:00 GMT'), $stu1));
+        $this->assertCount(0, $courseman->get_activities('forum', strtotime('2015-10-22 00:00:00 GMT'),
+            strtotime('2015-10-23 00:00:00 GMT'), $stu1));
 
         // Condition until after provided start time and before provided end time.
-        $this->assertCount(1, $courseman->get_activities('forum', strtotime('2015-10-22 00:00:00 GMT'), strtotime('2015-10-25 00:00:00 GMT'), $stu1));
+        $this->assertCount(1, $courseman->get_activities('forum', strtotime('2015-10-22 00:00:00 GMT'),
+            strtotime('2015-10-25 00:00:00 GMT'), $stu1));
     }
 
+    /**
+     * test_get_activities_with_weeks
+     *
+     * @return void
+     */
     public function test_get_activities_with_weeks() {
 
         $startdate = gmmktime('0', '0', '0', 10, 24, 2015);
@@ -112,7 +126,7 @@ public function test_get_activities_with_weeks() {
 
         list($course, $stu1) = $this->setup_course($record);
 
-        // forum1 is ignored as section 0 does not count.
+        // Forum1 is ignored as section 0 does not count.
         $forum1 = $this->getDataGenerator()->create_module('forum', array('course' => $course->id),
             array('section' => 0));
         $forum2 = $this->getDataGenerator()->create_module('forum', array('course' => $course->id),
@@ -138,9 +152,14 @@ public function test_get_activities_with_weeks() {
         $this->assertCount(2, $courseman->get_activities('forum', $forth, $forth + WEEKSECS, $stu1));
     }
 
+    /**
+     * test_get_activities_by_section
+     *
+     * @return void
+     */
     public function test_get_activities_by_section() {
 
-        // This makes debugging easier, sorry WA's +8 :)
+        // This makes debugging easier, sorry WA's +8 :).
         $this->setTimezone('UTC');
 
         // 1 year.
@@ -156,7 +175,7 @@ public function test_get_activities_by_section() {
 
         list($course, $stu1) = $this->setup_course($record);
 
-        // forum1 is ignored as section 0 does not count.
+        // Forum1 is ignored as section 0 does not count.
         $forum1 = $this->getDataGenerator()->create_module('forum', array('course' => $course->id),
             array('section' => 0));
         $forum2 = $this->getDataGenerator()->create_module('forum', array('course' => $course->id),
@@ -187,8 +206,8 @@ public function test_get_activities_by_section() {
 
         // Split the course in as many parts as sections.
         $duration = ($enddate - $startdate) / $numsections;
-        for($i = 1; $i <= $numsections; $i++) {
-            // -1 because section 1 start represents the course start.
+        for ($i = 1; $i <= $numsections; $i++) {
+            // The -1 because section 1 start represents the course start.
             $timeranges[$i] = $startdate + ($duration * ($i - 1));
         }
         $this->assertCount(1, $courseman->get_activities('forum', $timeranges[1], $timeranges[1] + $duration, $stu1));
@@ -202,6 +221,12 @@ public function test_get_activities_by_section() {
         $this->assertCount(0, $courseman->get_activities('forum', $timeranges[3], $timeranges[3] + $duration, $stu1));
     }
 
+    /**
+     * setup_course
+     *
+     * @param stdClass $courserecord
+     * @return array
+     */
     protected function setup_course($courserecord = null) {
         global $CFG;
 
diff --git a/analytics/tests/course_test.php b/analytics/tests/course_test.php
index ba8e4c54a3c3b..f96bcb7fa6f66 100644
--- a/analytics/tests/course_test.php
+++ b/analytics/tests/course_test.php
@@ -47,7 +47,6 @@ public function setUp() {
         $this->editingteacherroleid = $DB->get_field('role', 'id', array('shortname' => 'editingteacher'));
         $this->teacherroleid = $DB->get_field('role', 'id', array('shortname' => 'teacher'));
 
-
         $this->getDataGenerator()->enrol_user($this->stu1->id, $this->course->id, $this->studentroleid);
         $this->getDataGenerator()->enrol_user($this->stu2->id, $this->course->id, $this->studentroleid);
         $this->getDataGenerator()->enrol_user($this->both->id, $this->course->id, $this->studentroleid);
@@ -69,7 +68,7 @@ public function test_users() {
         $this->assertCount(2, $courseman->get_user_ids(array($this->editingteacherroleid)));
         $this->assertCount(1, $courseman->get_user_ids(array($this->teacherroleid)));
 
-        // Distinct is applied
+        // Distinct is applied.
         $this->assertCount(3, $courseman->get_user_ids(array($this->editingteacherroleid, $this->teacherroleid)));
         $this->assertCount(4, $courseman->get_user_ids(array($this->editingteacherroleid, $this->studentroleid)));
     }
diff --git a/analytics/tests/fixtures/test_indicator_fullname.php b/analytics/tests/fixtures/test_indicator_fullname.php
index 7d52ad7f013ef..6c47bb5859b58 100644
--- a/analytics/tests/fixtures/test_indicator_fullname.php
+++ b/analytics/tests/fixtures/test_indicator_fullname.php
@@ -1,15 +1,65 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
+/**
+ * Test indicator.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Test indicator.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 class test_indicator_fullname extends \core_analytics\local\indicator\linear {
 
+    /**
+     * include_averages
+     *
+     * @return bool
+     */
     protected static function include_averages() {
         return false;
     }
 
+    /**
+     * required_sample_data
+     *
+     * @return string[]
+     */
     public static function required_sample_data() {
         return array('course');
     }
 
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param string $samplesorigin
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
     protected function calculate_sample($sampleid, $samplesorigin, $starttime, $endtime) {
         global $DB;
 
@@ -26,5 +76,4 @@ protected function calculate_sample($sampleid, $samplesorigin, $starttime, $endt
             return self::MAX_VALUE;
         }
     }
-
 }
diff --git a/analytics/tests/fixtures/test_indicator_max.php b/analytics/tests/fixtures/test_indicator_max.php
index 752e843775a3c..60102fdc77bc0 100644
--- a/analytics/tests/fixtures/test_indicator_max.php
+++ b/analytics/tests/fixtures/test_indicator_max.php
@@ -1,6 +1,47 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
+/**
+ * Test indicator.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Test indicator.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 class test_indicator_max extends \core_analytics\local\indicator\binary {
+
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param string $samplesorigin
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
     protected function calculate_sample($sampleid, $samplesorigin, $starttime, $endtime) {
         return self::MAX_VALUE;
     }
diff --git a/analytics/tests/fixtures/test_indicator_min.php b/analytics/tests/fixtures/test_indicator_min.php
index 19e19f8eb4ee2..1d11f59fffacf 100644
--- a/analytics/tests/fixtures/test_indicator_min.php
+++ b/analytics/tests/fixtures/test_indicator_min.php
@@ -1,6 +1,47 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
+/**
+ * Test indicator.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Test indicator.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 class test_indicator_min extends \core_analytics\local\indicator\binary {
+
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param string $samplesorigin
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
     protected function calculate_sample($sampleid, $samplesorigin, $starttime, $endtime) {
         return self::MIN_VALUE;
     }
diff --git a/analytics/tests/fixtures/test_indicator_random.php b/analytics/tests/fixtures/test_indicator_random.php
index 113b352e3d875..a94be7424be82 100644
--- a/analytics/tests/fixtures/test_indicator_random.php
+++ b/analytics/tests/fixtures/test_indicator_random.php
@@ -1,10 +1,48 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
+/**
+ * Test indicator.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Test indicator.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 class test_indicator_random extends \core_analytics\local\indicator\binary {
 
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param string $samplesorigin
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
     protected function calculate_sample($sampleid, $samplesorigin, $starttime, $endtime) {
-        global $DB;
-
         return mt_rand(-1, 1);
     }
 }
diff --git a/analytics/tests/fixtures/test_static_target_shortname.php b/analytics/tests/fixtures/test_static_target_shortname.php
index 0f36d517a8964..fe2e65cb75aca 100644
--- a/analytics/tests/fixtures/test_static_target_shortname.php
+++ b/analytics/tests/fixtures/test_static_target_shortname.php
@@ -1,13 +1,59 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
+/**
+ * Test static target.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Test static target.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 class test_static_target_shortname extends \core_analytics\local\target\binary {
 
+    /**
+     * predictions
+     *
+     * @var array
+     */
     protected $predictions = array();
 
+    /**
+     * get_analyser_class
+     *
+     * @return string
+     */
     public function get_analyser_class() {
         return '\core_analytics\local\analyser\site_courses';
     }
 
+    /**
+     * classes_description
+     *
+     * @return string[]
+     */
     public static function classes_description() {
         return array(
             'Course fullname first char is A',
@@ -17,7 +63,7 @@ public static function classes_description() {
 
     /**
      * We don't want to discard results.
-     * @return float
+     * @return null
      */
     protected function min_prediction_score() {
         return null;
@@ -31,23 +77,52 @@ protected function ignored_predicted_classes() {
         return array();
     }
 
+    /**
+     * is_valid_analysable
+     *
+     * @param \core_analytics\analysable $analysable
+     * @param bool $fortraining
+     * @return bool
+     */
     public function is_valid_analysable(\core_analytics\analysable $analysable, $fortraining = true) {
         // This is testing, let's make things easy.
         return true;
     }
 
-    protected function calculate_sample($sampleid, \core_analytics\analysable $analysable, $starttime = false, $endtime = false) {
-        global $DB;
-
-        $sample = $DB->get_record('course', array('id' => $sampleid));
+    /**
+     * is_valid_sample
+     *
+     * @param int $sampleid
+     * @param \core_analytics\analysable $analysable
+     * @param bool $fortraining
+     * @return bool
+     */
+    public function is_valid_sample($sampleid, \core_analytics\analysable $analysable, $fortraining = true) {
+        // We skip not-visible courses during training as a way to emulate the training data / prediction data difference.
+        // In normal circumstances is_valid_sample will return false when they receive a sample that can not be
+        // processed.
+        if (!$fortraining) {
+            return true;
+        }
 
+        $sample = $this->retrieve('course', $sampleid);
         if ($sample->visible == 0) {
-            // We skip not-visible courses as a way to emulate the training data / prediction data difference.
-            // In normal circumstances targets will return null when they receive a sample that can not be
-            // processed, that same sample may be used for prediction.
-            // We can not do this in is_valid_analysable because the analysable there is the site not the course.
-            return null;
+            return false;
         }
+        return true;
+    }
+
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param \core_analytics\analysable $analysable
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
+    protected function calculate_sample($sampleid, \core_analytics\analysable $analysable, $starttime = false, $endtime = false) {
+        $sample = $this->retrieve('course', $sampleid);
 
         $firstchar = substr($sample->shortname, 0, 1);
         if ($firstchar === 'a') {
diff --git a/analytics/tests/fixtures/test_target_shortname.php b/analytics/tests/fixtures/test_target_shortname.php
index 890e7eb5eceb0..507499fe69321 100644
--- a/analytics/tests/fixtures/test_target_shortname.php
+++ b/analytics/tests/fixtures/test_target_shortname.php
@@ -1,13 +1,59 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
 
+/**
+ * Test target.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * Test target.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 class test_target_shortname extends \core_analytics\local\target\binary {
 
+    /**
+     * predictions
+     *
+     * @var array
+     */
     protected $predictions = array();
 
+    /**
+     * get_analyser_class
+     *
+     * @return string
+     */
     public function get_analyser_class() {
         return '\core_analytics\local\analyser\site_courses';
     }
 
+    /**
+     * classes_description
+     *
+     * @return string[]
+     */
     public static function classes_description() {
         return array(
             'Course fullname first char is A',
@@ -31,11 +77,26 @@ protected function ignored_predicted_classes() {
         return array();
     }
 
+    /**
+     * is_valid_analysable
+     *
+     * @param \core_analytics\analysable $analysable
+     * @param bool $fortraining
+     * @return bool
+     */
     public function is_valid_analysable(\core_analytics\analysable $analysable, $fortraining = true) {
         // This is testing, let's make things easy.
         return true;
     }
 
+    /**
+     * is_valid_sample
+     *
+     * @param int $sampleid
+     * @param \core_analytics\analysable $analysable
+     * @param bool $fortraining
+     * @return bool
+     */
     public function is_valid_sample($sampleid, \core_analytics\analysable $analysable, $fortraining = true) {
         // We skip not-visible courses during training as a way to emulate the training data / prediction data difference.
         // In normal circumstances is_valid_sample will return false when they receive a sample that can not be
@@ -51,6 +112,15 @@ public function is_valid_sample($sampleid, \core_analytics\analysable $analysabl
         return true;
     }
 
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param \core_analytics\analysable $analysable
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
     protected function calculate_sample($sampleid, \core_analytics\analysable $analysable, $starttime = false, $endtime = false) {
 
         $sample = $this->retrieve('course', $sampleid);
diff --git a/analytics/tests/model_test.php b/analytics/tests/model_test.php
index 36c74696ed91c..ad351f8317b9a 100644
--- a/analytics/tests/model_test.php
+++ b/analytics/tests/model_test.php
@@ -17,7 +17,7 @@
 /**
  * Unit tests for the model.
  *
- * @package   analytics
+ * @package   core_analytics
  * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
@@ -32,7 +32,7 @@
 /**
  * Unit tests for the model.
  *
- * @package   analytics
+ * @package   core_analytics
  * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
@@ -142,12 +142,32 @@ public function test_unique_id() {
     }
 }
 
+/**
+ * Testable version to change methods' visibility.
+ *
+ * @package   core_analytics
+ * @copyright 2017 David Monllaó {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 class testable_model extends \core_analytics\model {
+
+    /**
+     * get_output_dir
+     *
+     * @param array $subdirs
+     * @return string
+     */
     public function get_output_dir($subdirs = array()) {
         return parent::get_output_dir($subdirs);
     }
 
+    /**
+     * init_analyser
+     *
+     * @param array $options
+     * @return void
+     */
     public function init_analyser($options = array()) {
-        return parent::init_analyser($options);
+        parent::init_analyser($options);
     }
 }
diff --git a/analytics/tests/prediction_test.php b/analytics/tests/prediction_test.php
index ad4a64116387b..6a41a0883a49b 100644
--- a/analytics/tests/prediction_test.php
+++ b/analytics/tests/prediction_test.php
@@ -40,9 +40,12 @@
 class core_analytics_prediction_testcase extends advanced_testcase {
 
     /**
+     * test_ml_training_and_prediction
+     *
      * @dataProvider provider_ml_training_and_prediction
      * @param string $timesplittingid
      * @param int $npredictedranges
+     * @param string $predictionsprocessorclass
      * @return void
      */
     public function test_ml_training_and_prediction($timesplittingid, $npredictedranges, $predictionsprocessorclass) {
@@ -112,7 +115,7 @@ public function test_ml_training_and_prediction($timesplittingid, $npredictedran
         // They will not be skipped for prediction though.
         $result = $model->predict();
 
-        // $course1 predictions should be 1 == 'a', $course2 predictions should be 0 == 'b'.
+        // Var $course1 predictions should be 1 == 'a', $course2 predictions should be 0 == 'b'.
         $correct = array($course1->id => 1, $course2->id => 0);
         foreach ($result->predictions as $uniquesampleid => $predictiondata) {
             list($sampleid, $rangeindex) = $model->get_time_splitting()->infer_sample_info($uniquesampleid);
@@ -127,7 +130,8 @@ public function test_ml_training_and_prediction($timesplittingid, $npredictedran
         $this->assertEquals(1, $DB->count_records('analytics_used_files',
             array('modelid' => $model->get_id(), 'action' => 'predicted')));
         // 2 predictions for each range.
-        $this->assertEquals(2 * $npredictedranges, $DB->count_records('analytics_predictions', array('modelid' => $model->get_id())));
+        $this->assertEquals(2 * $npredictedranges, $DB->count_records('analytics_predictions',
+            array('modelid' => $model->get_id())));
 
         // No new generated files nor records as there are no new courses available.
         $model->predict();
@@ -135,9 +139,15 @@ public function test_ml_training_and_prediction($timesplittingid, $npredictedran
         $this->assertEquals($npredictedranges, count($trainedsamples));
         $this->assertEquals(1, $DB->count_records('analytics_used_files',
             array('modelid' => $model->get_id(), 'action' => 'predicted')));
-        $this->assertEquals(2 * $npredictedranges, $DB->count_records('analytics_predictions', array('modelid' => $model->get_id())));
+        $this->assertEquals(2 * $npredictedranges, $DB->count_records('analytics_predictions',
+            array('modelid' => $model->get_id())));
     }
 
+    /**
+     * provider_ml_training_and_prediction
+     *
+     * @return array
+     */
     public function provider_ml_training_and_prediction() {
         $cases = array(
             'no_splitting' => array('\core_analytics\local\time_splitting\no_splitting', 1),
@@ -153,6 +163,11 @@ public function provider_ml_training_and_prediction() {
      * Basic test to check that prediction processors work as expected.
      *
      * @dataProvider provider_ml_test_evaluation
+     * @param string $modelquality
+     * @param int $ncourses
+     * @param array $expected
+     * @param string $predictionsprocessorclass
+     * @return void
      */
     public function test_ml_evaluation($modelquality, $ncourses, $expected, $predictionsprocessorclass) {
         $this->resetAfterTest(true);
@@ -172,7 +187,6 @@ public function test_ml_evaluation($modelquality, $ncourses, $expected, $predict
             throw new \coding_exception('Only perfect and random accepted as $modelquality values');
         }
 
-
         // Generate training data.
         $params = array(
             'startdate' => mktime(0, 0, 0, 10, 24, 2015),
@@ -202,12 +216,19 @@ public function test_ml_evaluation($modelquality, $ncourses, $expected, $predict
         // We check that the returned status includes at least $expectedcode code.
         foreach ($results as $timesplitting => $result) {
             $message = 'The returned status code ' . $result->status . ' should include ' . $expected[$timesplitting];
-            $this->assertEquals($expected[$timesplitting], $result->status & $expected[$timesplitting], $message);
+            $filtered = $result->status & $expected[$timesplitting];
+            $this->assertEquals($expected[$timesplitting], $filtered, $message);
         }
     }
 
+    /**
+     * provider_ml_test_evaluation
+     *
+     * @return array
+     */
     public function provider_ml_test_evaluation() {
 
+        $notenoughandlowscore = \core_analytics\model::EVALUATE_NOT_ENOUGH_DATA + \core_analytics\model::EVALUATE_LOW_SCORE;
         $cases = array(
             'bad-and-no-enough-data' => array(
                 'modelquality' => 'random',
@@ -216,8 +237,8 @@ public function provider_ml_test_evaluation() {
                     // The course duration is too much to be processed by in weekly basis.
                     '\core_analytics\local\time_splitting\weekly' => \core_analytics\model::NO_DATASET,
                     // 10 samples is not enough to process anything.
-                    '\core_analytics\local\time_splitting\single_range' => \core_analytics\model::EVALUATE_NOT_ENOUGH_DATA + \core_analytics\model::EVALUATE_LOW_SCORE,
-                    '\core_analytics\local\time_splitting\quarters' => \core_analytics\model::EVALUATE_NOT_ENOUGH_DATA + \core_analytics\model::EVALUATE_LOW_SCORE,
+                    '\core_analytics\local\time_splitting\single_range' => $notenoughandlowscore,
+                    '\core_analytics\local\time_splitting\quarters' => $notenoughandlowscore,
                 )
             ),
             'bad' => array(
@@ -244,6 +265,11 @@ public function provider_ml_test_evaluation() {
         return $this->add_prediction_processors($cases);
     }
 
+    /**
+     * add_random_model
+     *
+     * @return \core_analytics\model
+     */
     protected function add_random_model() {
 
         $target = \core_analytics\manager::get_target('test_target_shortname');
@@ -258,6 +284,11 @@ protected function add_random_model() {
         return new \core_analytics\model($model->get_id());
     }
 
+    /**
+     * add_perfect_model
+     *
+     * @return \core_analytics\model
+     */
     protected function add_perfect_model() {
 
         $target = \core_analytics\manager::get_target('test_target_shortname');
@@ -272,6 +303,12 @@ protected function add_perfect_model() {
         return new \core_analytics\model($model->get_id());
     }
 
+    /**
+     * add_prediction_processors
+     *
+     * @param array $cases
+     * @return array
+     */
     protected function add_prediction_processors($cases) {
 
         $return = array();
diff --git a/course/classes/analytics/indicator/no_teacher.php b/course/classes/analytics/indicator/no_teacher.php
index 5372c51e8c704..54687cd24930d 100644
--- a/course/classes/analytics/indicator/no_teacher.php
+++ b/course/classes/analytics/indicator/no_teacher.php
@@ -35,10 +35,20 @@
  */
 class no_teacher extends \core_analytics\local\indicator\binary {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:noteacher', 'moodle');
     }
 
+    /**
+     * required_sample_data
+     *
+     * @return string[]
+     */
     public static function required_sample_data() {
         // We require course because, although calculate_sample only reads context, we need the context to be course
         // or below.
diff --git a/lib/classes/component.php b/lib/classes/component.php
index b4eee454e696f..277d7db6942d7 100644
--- a/lib/classes/component.php
+++ b/lib/classes/component.php
@@ -83,6 +83,7 @@ class core_component {
         'MatthiasMullie\\Minify' => 'lib/minify/matthiasmullie-minify/src/',
         'MatthiasMullie\\PathConverter' => 'lib/minify/matthiasmullie-pathconverter/src/',
         'IMSGlobal\LTI' => 'lib/ltiprovider/src',
+        'Phpml' => 'lib/mlbackend/php/phpml/src/Phpml',
     );
 
     /**
diff --git a/lib/classes/event/prediction_action_started.php b/lib/classes/event/prediction_action_started.php
index 2b25e300557b7..6cd4705a0268a 100644
--- a/lib/classes/event/prediction_action_started.php
+++ b/lib/classes/event/prediction_action_started.php
@@ -70,7 +70,8 @@ public static function get_name() {
      * @return string
      */
     public function get_description() {
-        return "The user with id '$this->userid' has started '{$this->other['actionname']}' action for the prediction with id '".$this->objectid."'.";
+        return "The user with id '$this->userid' has started '{$this->other['actionname']}' action for the prediction with id '" .
+            $this->objectid . "'.";
     }
 
     /**
@@ -95,6 +96,11 @@ protected function validate_data() {
         }
     }
 
+    /**
+     * get_objectid_mapping
+     *
+     * @return array
+     */
     public static function get_objectid_mapping() {
         return array('db' => 'analytics_predictions');
     }
diff --git a/lib/db/upgrade.php b/lib/db/upgrade.php
index 876ac445c55b0..30220900c9504 100644
--- a/lib/db/upgrade.php
+++ b/lib/db/upgrade.php
@@ -2084,7 +2084,8 @@ function xmldb_main_upgrade($oldversion) {
         $table->add_key('primary', XMLDB_KEY_PRIMARY, array('id'));
 
         // Adding indexes to table analytics_train_samples.
-        $table->add_index('modelidandanalysableidandtimesplitting', XMLDB_INDEX_NOTUNIQUE, array('modelid', 'analysableid', 'timesplitting'));
+        $table->add_index('modelidandanalysableidandtimesplitting', XMLDB_INDEX_NOTUNIQUE,
+            array('modelid', 'analysableid', 'timesplitting'));
 
         // Conditionally launch create table for analytics_train_samples.
         if (!$dbman->table_exists($table)) {
@@ -2106,7 +2107,8 @@ function xmldb_main_upgrade($oldversion) {
         $table->add_key('primary', XMLDB_KEY_PRIMARY, array('id'));
 
         // Adding indexes to table analytics_predict_ranges.
-        $table->add_index('modelidandanalysableidandtimesplitting', XMLDB_INDEX_NOTUNIQUE, array('modelid', 'analysableid', 'timesplitting'));
+        $table->add_index('modelidandanalysableidandtimesplitting', XMLDB_INDEX_NOTUNIQUE,
+            array('modelid', 'analysableid', 'timesplitting'));
 
         // Conditionally launch create table for analytics_predict_ranges.
         if (!$dbman->table_exists($table)) {
diff --git a/lib/enrollib.php b/lib/enrollib.php
index c9cc8ee477917..01c31401588e2 100644
--- a/lib/enrollib.php
+++ b/lib/enrollib.php
@@ -1434,9 +1434,9 @@ function enrol_get_course_by_user_enrolment_id($ueid) {
  *
  * @param int $courseid Course id or false if using $uefilter (user enrolment ids may belong to different courses)
  * @param bool $onlyactive consider only active enrolments in enabled plugins and time restrictions
- * @param array usersfilter Limit the results obtained to this list of user ids. $uefilter compatibility not guaranteed.
- * @param array uefilter Limit the results obtained to this list of user enrolment ids. $usersfilter compatibility not guaranteed.
- * @return stdClass
+ * @param array $usersfilter Limit the results obtained to this list of user ids. $uefilter compatibility not guaranteed.
+ * @param array $uefilter Limit the results obtained to this list of user enrolment ids. $usersfilter compatibility not guaranteed.
+ * @return stdClass[]
  */
 function enrol_get_course_users($courseid = false, $onlyactive = false, $usersfilter = array(), $uefilter = array()) {
     global $DB;
@@ -1460,8 +1460,10 @@ function enrol_get_course_users($courseid = false, $onlyactive = false, $usersfi
     }
 
     if ($onlyactive) {
-        $conditions[] = "ue.status = :active AND e.status = :enabled AND ue.timestart < :now1 AND (ue.timeend = 0 OR ue.timeend > :now2)";
-        $params['now1']    = round(time(), -2); // improves db caching
+        $conditions[] = "ue.status = :active AND e.status = :enabled AND ue.timestart < :now1 AND " .
+            "(ue.timeend = 0 OR ue.timeend > :now2)";
+        // Improves db caching.
+        $params['now1']    = round(time(), -2);
         $params['now2']    = $params['now1'];
         $params['active']  = ENROL_USER_ACTIVE;
         $params['enabled'] = ENROL_INSTANCE_ENABLED;
@@ -1483,8 +1485,13 @@ function enrol_get_course_users($courseid = false, $onlyactive = false, $usersfi
 }
 
 /**
+ * Enrolment plugins abstract class.
+ *
  * All enrol plugins should be based on this class,
  * this is also the main source of documentation.
+ *
+ * @copyright  2010 Petr Skoda {@link http://skodak.org}
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 abstract class enrol_plugin {
     protected $config = null;
diff --git a/lib/mlbackend/php/classes/processor.php b/lib/mlbackend/php/classes/processor.php
index 891d1d8eedce1..294f8cdffd355 100644
--- a/lib/mlbackend/php/classes/processor.php
+++ b/lib/mlbackend/php/classes/processor.php
@@ -24,20 +24,12 @@
 
 namespace mlbackend_php;
 
-// TODO No support for 3rd party plugins psr4??
-spl_autoload_register(function($class) {
-    // Autoload Phpml classes.
-    $path = __DIR__ . '/../phpml/src/' . str_replace('\\', '/', $class) . '.php';
-    if (file_exists($path)) {
-        require_once($path);
-    }
-});
+defined('MOODLE_INTERNAL') || die();
 
 use Phpml\Preprocessing\Normalizer;
 use Phpml\CrossValidation\RandomSplit;
 use Phpml\Dataset\ArrayDataset;
-
-defined('MOODLE_INTERNAL') || die();
+use Phpml\ModelManager;
 
 /**
  * PHP predictions processor.
@@ -48,12 +40,31 @@
  */
 class processor implements \core_analytics\predictor {
 
+    /**
+     * Size of training / prediction batches.
+     */
     const BATCH_SIZE = 5000;
+
+    /**
+     * Number of train iterations.
+     */
     const TRAIN_ITERATIONS = 500;
+
+    /**
+     * File name of the serialised model.
+     */
     const MODEL_FILENAME = 'model.ser';
 
+    /**
+     * @var bool
+     */
     protected $limitedsize = false;
 
+    /**
+     * Checks if the processor is ready to use.
+     *
+     * @return bool
+     */
     public function is_ready() {
         if (version_compare(phpversion(), '7.0.0') < 0) {
             return get_string('errorphp7required', 'mlbackend_php');
@@ -61,12 +72,20 @@ public function is_ready() {
         return true;
     }
 
+    /**
+     * Trains a machine learning algorithm with the provided training set.
+     *
+     * @param string $uniqueid
+     * @param \stored_file $dataset
+     * @param string $outputdir
+     * @return \stdClass
+     */
     public function train($uniqueid, \stored_file $dataset, $outputdir) {
 
         // Output directory is already unique to the model.
         $modelfilepath = $outputdir . DIRECTORY_SEPARATOR . self::MODEL_FILENAME;
 
-        $modelmanager = new \Phpml\ModelManager();
+        $modelmanager = new ModelManager();
 
         if (file_exists($modelfilepath)) {
             $classifier = $modelmanager->restoreFromFile($modelfilepath);
@@ -114,6 +133,14 @@ public function train($uniqueid, \stored_file $dataset, $outputdir) {
         return $resultobj;
     }
 
+    /**
+     * Predicts the provided samples
+     *
+     * @param string $uniqueid
+     * @param \stored_file $dataset
+     * @param string $outputdir
+     * @return \stdClass
+     */
     public function predict($uniqueid, \stored_file $dataset, $outputdir) {
 
         // Output directory is already unique to the model.
@@ -123,7 +150,7 @@ public function predict($uniqueid, \stored_file $dataset, $outputdir) {
             throw new \moodle_exception('errorcantloadmodel', 'analytics', '', $modelfilepath);
         }
 
-        $modelmanager = new \Phpml\ModelManager();
+        $modelmanager = new ModelManager();
         $classifier = $modelmanager->restoreFromFile($modelfilepath);
 
         $fh = $dataset->get_content_file_handle();
@@ -204,7 +231,7 @@ public function evaluate($uniqueid, $maxdeviation, $niterations, \stored_file $d
 
             // Just an approximation, will depend on PHP version, compile options...
             // Double size + zval struct (6 bytes + 8 bytes + 16 bytes) + array bucket (96 bytes)
-            // https://nikic.github.io/2011/12/12/How-big-are-PHP-arrays-really-Hint-BIG.html
+            // https://nikic.github.io/2011/12/12/How-big-are-PHP-arrays-really-Hint-BIG.html.
             $floatsize = (PHP_INT_SIZE * 2) + 6 + 8 + 16 + 96;
         }
 
@@ -219,7 +246,7 @@ public function evaluate($uniqueid, $maxdeviation, $niterations, \stored_file $d
             if (empty($CFG->mlbackend_php_no_evaluation_limits)) {
                 // We allow admins to disable evaluation memory usage limits by modifying config.php.
 
-                // We will have plenty of missing values in the dataset so it should be a conservative approximation:
+                // We will have plenty of missing values in the dataset so it should be a conservative approximation.
                 $samplessize = $samplessize + (count($sampledata) * $floatsize);
 
                 // Stop fetching more samples.
@@ -251,8 +278,17 @@ public function evaluate($uniqueid, $maxdeviation, $niterations, \stored_file $d
         return $this->get_evaluation_result_object($dataset, $phis, $maxdeviation);
     }
 
+    /**
+     * Returns the results objects from all evaluations.
+     *
+     * @param \stored_file $dataset
+     * @param array $phis
+     * @param float $maxdeviation
+     * @return \stdClass
+     */
     protected function get_evaluation_result_object(\stored_file $dataset, $phis, $maxdeviation) {
 
+        // Average phi of all evaluations as final score.
         if (count($phis) === 1) {
             $avgphi = reset($phis);
         } else {
@@ -300,6 +336,13 @@ protected function get_evaluation_result_object(\stored_file $dataset, $phis, $m
         return $resultobj;
     }
 
+    /**
+     * Returns the Phi correlation coefficient.
+     *
+     * @param array $testlabels
+     * @param array $predictedlabels
+     * @return float
+     */
     protected function get_phi($testlabels, $predictedlabels) {
 
         // Binary here only as well.
@@ -320,6 +363,14 @@ protected function get_phi($testlabels, $predictedlabels) {
         return $phi;
     }
 
+    /**
+     * Extracts metadata from the dataset file.
+     *
+     * The file poiter should be located at the top of the file.
+     *
+     * @param resource $fh
+     * @return array
+     */
     protected function extract_metadata($fh) {
         $metadata = fgetcsv($fh);
         return array_combine($metadata, fgetcsv($fh));
diff --git a/lib/mlbackend/php/lang/en/mlbackend_php.php b/lib/mlbackend/php/lang/en/mlbackend_php.php
index 2262879f941b2..2a821a40b36cb 100644
--- a/lib/mlbackend/php/lang/en/mlbackend_php.php
+++ b/lib/mlbackend/php/lang/en/mlbackend_php.php
@@ -1,4 +1,26 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Strings for component 'mlbackend_php'
+ *
+ * @package   mlbackend_php
+ * @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 
 $string['datasetsizelimited'] = 'Only a part of the evaluation dataset has been evaluated due to its size. Set $CFG->mlbackend_php_no_memory_limit if you are confident that your system can cope a {$a} dataset';
 $string['errorcantloadmodel'] = 'Model file {$a} does not exist, ensure the model has been trained before using it to predict.';
diff --git a/lib/mlbackend/python/classes/processor.php b/lib/mlbackend/python/classes/processor.php
index 5bb40e8823bc7..e0e042d101b55 100644
--- a/lib/mlbackend/python/classes/processor.php
+++ b/lib/mlbackend/python/classes/processor.php
@@ -35,11 +35,19 @@
  */
 class processor implements \core_analytics\predictor {
 
+    /**
+     * The required version of the python package that performs all calculations.
+     */
     const REQUIRED_PIP_PACKAGE_VERSION = '0.0.9';
 
+    /**
+     * Is the plugin ready to be used?.
+     *
+     * @return bool
+     */
     public function is_ready() {
 
-        # Check the installed pip package version.
+        // Check the installed pip package version.
         $cmd = 'python -m moodleinspire.version';
 
         $output = null;
@@ -63,8 +71,17 @@ public function is_ready() {
         return get_string('pythonpackagenotinstalled', 'mlbackend_python', $cmd);
     }
 
+    /**
+     * Trains a machine learning algorithm with the provided dataset.
+     *
+     * @param string $uniqueid
+     * @param \stored_file $dataset
+     * @param string $outputdir
+     * @return \stdClass
+     */
     public function train($uniqueid, \stored_file $dataset, $outputdir) {
 
+        // Obtain the physical route to the file.
         $datasetpath = $this->get_file_path($dataset);
 
         $cmd = 'python -m moodleinspire.training ' .
@@ -95,8 +112,17 @@ public function train($uniqueid, \stored_file $dataset, $outputdir) {
         return $resultobj;
     }
 
+    /**
+     * Returns predictions for the provided dataset samples.
+     *
+     * @param string $uniqueid
+     * @param \stored_file $dataset
+     * @param string $outputdir
+     * @return \stdClass
+     */
     public function predict($uniqueid, \stored_file $dataset, $outputdir) {
 
+        // Obtain the physical route to the file.
         $datasetpath = $this->get_file_path($dataset);
 
         $cmd = 'python -m moodleinspire.prediction ' .
@@ -127,8 +153,19 @@ public function predict($uniqueid, \stored_file $dataset, $outputdir) {
         return $resultobj;
     }
 
+    /**
+     * Evaluates the provided dataset.
+     *
+     * @param string $uniqueid
+     * @param float $maxdeviation
+     * @param int $niterations
+     * @param \stored_file $dataset
+     * @param string $outputdir
+     * @return \stdClass
+     */
     public function evaluate($uniqueid, $maxdeviation, $niterations, \stored_file $dataset, $outputdir) {
 
+        // Obtain the physical route to the file.
         $datasetpath = $this->get_file_path($dataset);
 
         $cmd = 'python -m moodleinspire.evaluation ' .
@@ -158,6 +195,12 @@ public function evaluate($uniqueid, $maxdeviation, $niterations, \stored_file $d
         return $resultobj;
     }
 
+    /**
+     * Returns the path to the dataset file.
+     *
+     * @param \stored_file $file
+     * @return string
+     */
     protected function get_file_path(\stored_file $file) {
         // From moodle filesystem to the local file system.
         // This is not ideal, but there is no read access to moodle filesystem files.
diff --git a/lib/mlbackend/python/lang/en/mlbackend_python.php b/lib/mlbackend/python/lang/en/mlbackend_python.php
index 1a2889a4b56c5..e201ddee98571 100644
--- a/lib/mlbackend/python/lang/en/mlbackend_python.php
+++ b/lib/mlbackend/python/lang/en/mlbackend_python.php
@@ -1,4 +1,26 @@
 <?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Strings for component 'mlbackend_python'
+ *
+ * @package   mlbackend_python
+ * @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
 
 $string['packageinstalledshouldbe'] = '"moodleinspire" python package should be updated. The required version is "{$a->required}" and the installed version is "{$a->installed}"';
 $string['pluginname'] = 'Python machine learning backend';
diff --git a/lib/tests/component_test.php b/lib/tests/component_test.php
index 30852a69b2a3a..24b0b6d840424 100644
--- a/lib/tests/component_test.php
+++ b/lib/tests/component_test.php
@@ -31,9 +31,11 @@
  */
 class core_component_testcase extends advanced_testcase {
 
-    // To be changed if number of subsystems increases/decreases,
-    // this is defined here to annoy devs that try to add more without any thinking,
-    // always verify that it does not collide with any existing add-on modules and subplugins!!!
+    /**
+     * To be changed if number of subsystems increases/decreases,
+     * this is defined here to annoy devs that try to add more without any thinking,
+     * always verify that it does not collide with any existing add-on modules and subplugins!!!
+     */
     const SUBSYSTEMCOUNT = 67;
 
     public function setUp() {
diff --git a/mod/assign/classes/analytics/indicator/activity_base.php b/mod/assign/classes/analytics/indicator/activity_base.php
index a73360c5567c2..f5a5203f98423 100644
--- a/mod/assign/classes/analytics/indicator/activity_base.php
+++ b/mod/assign/classes/analytics/indicator/activity_base.php
@@ -35,10 +35,20 @@
  */
 abstract class activity_base extends \core_analytics\local\indicator\community_of_inquiry_activity {
 
+    /**
+     * feedback_viewed_events
+     *
+     * @return string[]
+     */
     protected function feedback_viewed_events() {
         return array('\mod_assign\event\feedback_viewed');
     }
 
+    /**
+     * feedback_check_grades
+     *
+     * @return bool
+     */
     protected function feedback_check_grades() {
         // We need the grade to be released to the student to consider that feedback has been provided.
         return true;
diff --git a/mod/assign/classes/analytics/indicator/cognitive_depth.php b/mod/assign/classes/analytics/indicator/cognitive_depth.php
index c95de32f999da..a499bd62a3b63 100644
--- a/mod/assign/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/assign/classes/analytics/indicator/cognitive_depth.php
@@ -35,22 +35,52 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthassign', 'mod_assign');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_cognitive_depth_level(\cm_info $cm) {
         return 5;
     }
 
+    /**
+     * feedback_submitted_events
+     *
+     * @return string[]
+     */
     protected function feedback_submitted_events() {
         return array('\mod_assign\event\assessable_submitted');
     }
 
+    /**
+     * feedback_replied
+     *
+     * @param \cm_info $cm
+     * @param int $contextid
+     * @param int $userid
+     * @param int $after
+     * @return bool
+     */
     protected function feedback_replied(\cm_info $cm, $contextid, $userid, $after = false) {
         // No level 4.
         return false;
diff --git a/mod/assign/classes/analytics/indicator/social_breadth.php b/mod/assign/classes/analytics/indicator/social_breadth.php
index ac9d8ec9ac81e..1ff1fda3e8f8d 100644
--- a/mod/assign/classes/analytics/indicator/social_breadth.php
+++ b/mod/assign/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthassign', 'mod_assign');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 2;
     }
diff --git a/mod/book/classes/analytics/indicator/cognitive_depth.php b/mod/book/classes/analytics/indicator/cognitive_depth.php
index 209467673dce3..37d3461b03dc4 100644
--- a/mod/book/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/book/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthbook', 'mod_book');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_cognitive_depth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/book/classes/analytics/indicator/social_breadth.php b/mod/book/classes/analytics/indicator/social_breadth.php
index f6d1fe3d00e0a..bbe6772b43686 100644
--- a/mod/book/classes/analytics/indicator/social_breadth.php
+++ b/mod/book/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthbook', 'mod_book');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/chat/classes/analytics/indicator/activity_base.php b/mod/chat/classes/analytics/indicator/activity_base.php
index 8970773dedf66..1264e17175527 100644
--- a/mod/chat/classes/analytics/indicator/activity_base.php
+++ b/mod/chat/classes/analytics/indicator/activity_base.php
@@ -35,11 +35,35 @@
  */
 abstract class activity_base extends \core_analytics\local\indicator\community_of_inquiry_activity {
 
+    /**
+     * feedback_viewed_events
+     *
+     * @return string[]
+     */
     protected function feedback_viewed_events() {
         return array('\mod_chat\event\course_module_viewed', '\mod_chat\event\message_sent',
             '\mod_chat\event\sessions_viewed');
     }
 
+    /**
+     * feedback_replied_events
+     *
+     * @return string[]
+     */
+    protected function feedback_replied_events() {
+        return array('\mod_chat\event\message_sent');
+    }
+
+    /**
+     * feedback_post_action
+     *
+     * @param \cm_info $cm
+     * @param int $contextid
+     * @param int $userid
+     * @param string[] $eventnames
+     * @param int $after
+     * @return bool
+     */
     protected function feedback_post_action(\cm_info $cm, $contextid, $userid, $eventnames, $after = false) {
 
         if (empty($this->activitylogs[$contextid][$userid])) {
@@ -75,6 +99,11 @@ protected function feedback_post_action(\cm_info $cm, $contextid, $userid, $even
         return false;
     }
 
+    /**
+     * feedback_check_grades
+     *
+     * @return bool
+     */
     protected function feedback_check_grades() {
         // Chat's feedback is not contained in grades.
         return false;
diff --git a/mod/chat/classes/analytics/indicator/cognitive_depth.php b/mod/chat/classes/analytics/indicator/cognitive_depth.php
index 9d3d354f3eaa5..aa74afd273f7f 100644
--- a/mod/chat/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/chat/classes/analytics/indicator/cognitive_depth.php
@@ -35,20 +35,31 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthchat', 'mod_chat');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     public function get_cognitive_depth_level(\cm_info $cm) {
         return 4;
     }
-
-    protected function feedback_replied_events() {
-        return array('\mod_chat\event\message_sent');
-    }
-
 }
diff --git a/mod/chat/classes/analytics/indicator/social_breadth.php b/mod/chat/classes/analytics/indicator/social_breadth.php
index 3261668994cdc..e751c4aaeda3c 100644
--- a/mod/chat/classes/analytics/indicator/social_breadth.php
+++ b/mod/chat/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthchat', 'mod_chat');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 2;
     }
diff --git a/mod/choice/classes/analytics/indicator/activity_base.php b/mod/choice/classes/analytics/indicator/activity_base.php
index f82a31763f769..4395c6fa93003 100644
--- a/mod/choice/classes/analytics/indicator/activity_base.php
+++ b/mod/choice/classes/analytics/indicator/activity_base.php
@@ -35,8 +35,18 @@
  */
 abstract class activity_base extends \core_analytics\local\indicator\community_of_inquiry_activity {
 
+    /**
+     * choicedata
+     *
+     * @var array
+     */
     protected $choicedata = array();
 
+    /**
+     * feedback_viewed_events
+     *
+     * @return string[]
+     */
     protected function feedback_viewed_events() {
         return array('\mod_choice\event\course_module_viewed', '\mod_choice\event\answer_updated');
     }
@@ -51,10 +61,20 @@ protected function fill_choice_data(\cm_info $cm) {
         global $DB;
 
         if (!isset($this->choicedata[$cm->instance])) {
-            $this->choicedata[$cm->instance] = $DB->get_record('choice', array('id' => $cm->instance), 'id, showresults, timeclose', MUST_EXIST);
+            $this->choicedata[$cm->instance] = $DB->get_record('choice', array('id' => $cm->instance),
+                'id, showresults, timeclose', MUST_EXIST);
         }
     }
 
+    /**
+     * feedback_viewed
+     *
+     * @param \cm_info $cm
+     * @param int $contextid
+     * @param int $userid
+     * @param int $after
+     * @return bool
+     */
     protected function feedback_viewed(\cm_info $cm, $contextid, $userid, $after = null) {
 
         // If results are shown after they answer a write action counts as feedback viewed.
diff --git a/mod/choice/classes/analytics/indicator/cognitive_depth.php b/mod/choice/classes/analytics/indicator/cognitive_depth.php
index 75adb841a7a8f..050f71ef2643b 100644
--- a/mod/choice/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/choice/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthchoice', 'mod_choice');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_cognitive_depth_level(\cm_info $cm) {
         $this->fill_choice_data($cm);
 
diff --git a/mod/choice/classes/analytics/indicator/social_breadth.php b/mod/choice/classes/analytics/indicator/social_breadth.php
index 518c52ef51f55..ff48e80331713 100644
--- a/mod/choice/classes/analytics/indicator/social_breadth.php
+++ b/mod/choice/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthchoice', 'mod_choice');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         $this->fill_choice_data($cm);
         return 2;
diff --git a/mod/data/classes/analytics/indicator/cognitive_depth.php b/mod/data/classes/analytics/indicator/cognitive_depth.php
index 29fd0202d39da..3380ce0c13f74 100644
--- a/mod/data/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/data/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthdata', 'mod_data');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     public function get_cognitive_depth_level(\cm_info $cm) {
         return 2;
     }
diff --git a/mod/data/classes/analytics/indicator/social_breadth.php b/mod/data/classes/analytics/indicator/social_breadth.php
index f52305a12e9bb..3156cfea9547a 100644
--- a/mod/data/classes/analytics/indicator/social_breadth.php
+++ b/mod/data/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthdata', 'mod_data');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/feedback/classes/analytics/indicator/activity_base.php b/mod/feedback/classes/analytics/indicator/activity_base.php
index b52ef325e70c0..72f31c1d0e1b8 100644
--- a/mod/feedback/classes/analytics/indicator/activity_base.php
+++ b/mod/feedback/classes/analytics/indicator/activity_base.php
@@ -40,6 +40,12 @@ abstract class activity_base extends \core_analytics\local\indicator\community_o
      */
     protected $publishstats = array();
 
+    /**
+     * fill_publishstats
+     *
+     * @param \cm_info $cm
+     * @return void
+     */
     protected function fill_publishstats(\cm_info $cm) {
         global $DB;
 
@@ -55,7 +61,7 @@ protected function fill_publishstats(\cm_info $cm) {
      * @param int $contextid
      * @param int $userid
      * @param int $after
-     * @return int
+     * @return bool
      */
     protected function feedback_viewed(\cm_info $cm, $contextid, $userid, $after = null) {
         // If stats are published any write action counts as viewed feedback.
diff --git a/mod/feedback/classes/analytics/indicator/cognitive_depth.php b/mod/feedback/classes/analytics/indicator/cognitive_depth.php
index 36fb88ea5f45b..7e39604f09f9d 100644
--- a/mod/feedback/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/feedback/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthfeedback', 'mod_feedback');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_cognitive_depth_level(\cm_info $cm) {
         $this->fill_publishstats($cm);
 
diff --git a/mod/feedback/classes/analytics/indicator/social_breadth.php b/mod/feedback/classes/analytics/indicator/social_breadth.php
index 358f87abae44f..67e8f60b4eade 100644
--- a/mod/feedback/classes/analytics/indicator/social_breadth.php
+++ b/mod/feedback/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthfeedback', 'mod_feedback');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         $this->fill_publishstats($cm);
 
diff --git a/mod/folder/classes/analytics/indicator/cognitive_depth.php b/mod/folder/classes/analytics/indicator/cognitive_depth.php
index 5a3c8b113bd66..ba814188399de 100644
--- a/mod/folder/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/folder/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthfolder', 'mod_folder');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_cognitive_depth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/folder/classes/analytics/indicator/social_breadth.php b/mod/folder/classes/analytics/indicator/social_breadth.php
index 5de069edd8236..9d5d821af39e5 100644
--- a/mod/folder/classes/analytics/indicator/social_breadth.php
+++ b/mod/folder/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthfolder', 'mod_folder');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/forum/classes/analytics/indicator/activity_base.php b/mod/forum/classes/analytics/indicator/activity_base.php
index 5d42dbce0002f..4772261c89165 100644
--- a/mod/forum/classes/analytics/indicator/activity_base.php
+++ b/mod/forum/classes/analytics/indicator/activity_base.php
@@ -35,11 +35,27 @@
  */
 abstract class activity_base extends \core_analytics\local\indicator\community_of_inquiry_activity {
 
+    /**
+     * feedback_viewed_events
+     *
+     * @return string[]
+     */
     protected function feedback_viewed_events() {
-        // We could add any forum event, but it will make feedback_post_action slower
-        return array('\mod_forum\event\assessable_uploaded', '\mod_forum\event\course_module_viewed', '\mod_forum\event\discussion_viewed');
+        // We could add any forum event, but it will make feedback_post_action slower.
+        return array('\mod_forum\event\assessable_uploaded', '\mod_forum\event\course_module_viewed',
+            '\mod_forum\event\discussion_viewed');
     }
 
+    /**
+     * feedback_post_action
+     *
+     * @param \cm_info $cm
+     * @param int $contextid
+     * @param int $userid
+     * @param string[] $eventnames
+     * @param int $after
+     * @return bool
+     */
     protected function feedback_post_action(\cm_info $cm, $contextid, $userid, $eventnames, $after = false) {
 
         if (empty($this->activitylogs[$contextid][$userid])) {
diff --git a/mod/forum/classes/analytics/indicator/cognitive_depth.php b/mod/forum/classes/analytics/indicator/cognitive_depth.php
index 573aeb506b957..026f4a783aa8a 100644
--- a/mod/forum/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/forum/classes/analytics/indicator/cognitive_depth.php
@@ -35,22 +35,48 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthforum', 'mod_forum');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     public function get_cognitive_depth_level(\cm_info $cm) {
         return 4;
     }
 
+    /**
+     * feedback_check_grades
+     *
+     * @return bool
+     */
     protected function feedback_check_grades() {
         return false;
     }
 
+    /**
+     * feedback_replied_events
+     *
+     * @return string[]
+     */
     protected function feedback_replied_events() {
         return array('\mod_forum\event\assessable_uploaded');
     }
diff --git a/mod/forum/classes/analytics/indicator/social_breadth.php b/mod/forum/classes/analytics/indicator/social_breadth.php
index 382b498b5100f..7cac14afc5154 100644
--- a/mod/forum/classes/analytics/indicator/social_breadth.php
+++ b/mod/forum/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthforum', 'mod_forum');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 2;
     }
diff --git a/mod/glossary/classes/analytics/indicator/cognitive_depth.php b/mod/glossary/classes/analytics/indicator/cognitive_depth.php
index 618326a81ff91..8aa13a278620a 100644
--- a/mod/glossary/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/glossary/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthglossary', 'mod_glossary');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     public function get_cognitive_depth_level(\cm_info $cm) {
         return 2;
     }
diff --git a/mod/glossary/classes/analytics/indicator/social_breadth.php b/mod/glossary/classes/analytics/indicator/social_breadth.php
index dbd1998e56ef0..95d0571333930 100644
--- a/mod/glossary/classes/analytics/indicator/social_breadth.php
+++ b/mod/glossary/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthglossary', 'mod_glossary');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/imscp/classes/analytics/indicator/cognitive_depth.php b/mod/imscp/classes/analytics/indicator/cognitive_depth.php
index 5485b4385aa3d..bf720343fa797 100644
--- a/mod/imscp/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/imscp/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthimscp', 'mod_imscp');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_cognitive_depth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/imscp/classes/analytics/indicator/social_breadth.php b/mod/imscp/classes/analytics/indicator/social_breadth.php
index 00468f34f714c..7b6a788e585e5 100644
--- a/mod/imscp/classes/analytics/indicator/social_breadth.php
+++ b/mod/imscp/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthimscp', 'mod_imscp');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/label/classes/analytics/indicator/cognitive_depth.php b/mod/label/classes/analytics/indicator/cognitive_depth.php
index df2d46694db38..0c1d365faa1dc 100644
--- a/mod/label/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/label/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthlabel', 'mod_label');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_cognitive_depth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/label/classes/analytics/indicator/social_breadth.php b/mod/label/classes/analytics/indicator/social_breadth.php
index 8950e87119b49..d2a0955e77718 100644
--- a/mod/label/classes/analytics/indicator/social_breadth.php
+++ b/mod/label/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthlabel', 'mod_label');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/lesson/classes/analytics/indicator/activity_base.php b/mod/lesson/classes/analytics/indicator/activity_base.php
index db0fb653574eb..f87612672c7a3 100644
--- a/mod/lesson/classes/analytics/indicator/activity_base.php
+++ b/mod/lesson/classes/analytics/indicator/activity_base.php
@@ -35,10 +35,20 @@
  */
 abstract class activity_base extends \core_analytics\local\indicator\community_of_inquiry_activity {
 
+    /**
+     * feedback_viewed_events
+     *
+     * @return string
+     */
     protected function feedback_viewed_events() {
         return array('\mod_lesson\event\lesson_ended');
     }
 
+    /**
+     * feedback_check_grades
+     *
+     * @return bool
+     */
     protected function feedback_check_grades() {
         // We don't need to check grades as we get the feedback while completing the activity.
         return false;
diff --git a/mod/lesson/classes/analytics/indicator/cognitive_depth.php b/mod/lesson/classes/analytics/indicator/cognitive_depth.php
index c2e709182a6f9..17f7122fdd0cb 100644
--- a/mod/lesson/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/lesson/classes/analytics/indicator/cognitive_depth.php
@@ -35,18 +35,43 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthlesson', 'mod_lesson');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_cognitive_depth_level(\cm_info $cm) {
         return 5;
     }
 
+    /**
+     * feedback_submitted
+     *
+     * @param \cm_info $cm
+     * @param int $contextid
+     * @param int $userid
+     * @param int $after
+     * @return bool
+     */
     protected function feedback_submitted(\cm_info $cm, $contextid, $userid, $after = false) {
         if (empty($this->activitylogs[$contextid][$userid]) ||
                 empty($this->activitylogs[$contextid][$userid]['\mod_lesson\event\lesson_ended'])) {
@@ -57,6 +82,15 @@ protected function feedback_submitted(\cm_info $cm, $contextid, $userid, $after
         return (2 >= count($this->activitylogs[$contextid][$userid]['\mod_lesson\event\lesson_ended']));
     }
 
+    /**
+     * feedback_replied
+     *
+     * @param \cm_info $cm
+     * @param int $contextid
+     * @param int $userid
+     * @param int $after
+     * @return bool
+     */
     protected function feedback_replied(\cm_info $cm, $contextid, $userid, $after = false) {
         // No level 4.
         return false;
diff --git a/mod/lesson/classes/analytics/indicator/social_breadth.php b/mod/lesson/classes/analytics/indicator/social_breadth.php
index bffa1500facec..0f1294c44a150 100644
--- a/mod/lesson/classes/analytics/indicator/social_breadth.php
+++ b/mod/lesson/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthlesson', 'mod_lesson');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 2;
     }
diff --git a/mod/lti/classes/analytics/indicator/activity_base.php b/mod/lti/classes/analytics/indicator/activity_base.php
index cec7537fe0783..06d379a4d0195 100644
--- a/mod/lti/classes/analytics/indicator/activity_base.php
+++ b/mod/lti/classes/analytics/indicator/activity_base.php
@@ -35,6 +35,11 @@
  */
 abstract class activity_base extends \core_analytics\local\indicator\community_of_inquiry_activity {
 
+    /**
+     * feedback_viewed_events
+     *
+     * @return string[]
+     */
     protected function feedback_viewed_events() {
         // Any view after the data graded counts as feedback viewed.
         return array('\mod_lti\event\course_module_viewed');
diff --git a/mod/lti/classes/analytics/indicator/cognitive_depth.php b/mod/lti/classes/analytics/indicator/cognitive_depth.php
index e37c536fb6305..247d0d8e6dc61 100644
--- a/mod/lti/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/lti/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthlti', 'mod_lti');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     public function get_cognitive_depth_level(\cm_info $cm) {
         return 3;
     }
diff --git a/mod/lti/classes/analytics/indicator/social_breadth.php b/mod/lti/classes/analytics/indicator/social_breadth.php
index 1bafb2f864a2f..f7b80d93efde9 100644
--- a/mod/lti/classes/analytics/indicator/social_breadth.php
+++ b/mod/lti/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthlti', 'mod_lti');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 2;
     }
diff --git a/mod/page/classes/analytics/indicator/cognitive_depth.php b/mod/page/classes/analytics/indicator/cognitive_depth.php
index 4fa02221be327..c5c0ba62bc7b4 100644
--- a/mod/page/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/page/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthpage', 'mod_page');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_cognitive_depth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/page/classes/analytics/indicator/social_breadth.php b/mod/page/classes/analytics/indicator/social_breadth.php
index fefc87becd08d..3fccfe6adeb3d 100644
--- a/mod/page/classes/analytics/indicator/social_breadth.php
+++ b/mod/page/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthpage', 'mod_page');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/quiz/classes/analytics/indicator/activity_base.php b/mod/quiz/classes/analytics/indicator/activity_base.php
index 60f18493a86c7..4f3804cbeba4c 100644
--- a/mod/quiz/classes/analytics/indicator/activity_base.php
+++ b/mod/quiz/classes/analytics/indicator/activity_base.php
@@ -35,11 +35,21 @@
  */
 abstract class activity_base extends \core_analytics\local\indicator\community_of_inquiry_activity {
 
+    /**
+     * feedback_check_grades
+     *
+     * @return bool
+     */
     protected function feedback_check_grades() {
         // We need the grade to be released to the student to consider that feedback has been provided.
         return true;
     }
 
+    /**
+     * feedback_viewed_events
+     *
+     * @return string[]
+     */
     protected function feedback_viewed_events() {
         return array('\mod_quiz\event\course_module_viewed');
     }
diff --git a/mod/quiz/classes/analytics/indicator/cognitive_depth.php b/mod/quiz/classes/analytics/indicator/cognitive_depth.php
index 6c31c779727b1..e47ffdb26627b 100644
--- a/mod/quiz/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/quiz/classes/analytics/indicator/cognitive_depth.php
@@ -35,22 +35,52 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthquiz', 'mod_quiz');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     public function get_cognitive_depth_level(\cm_info $cm) {
         return 5;
     }
 
+    /**
+     * feedback_submitted_events
+     *
+     * @return string[]
+     */
     protected function feedback_submitted_events() {
         return array('\mod_quiz\event\attempt_submitted');
     }
 
+    /**
+     * feedback_replied
+     *
+     * @param \cm_info $cm
+     * @param int $contextid
+     * @param int $userid
+     * @param int $after
+     * @return bool
+     */
     protected function feedback_replied(\cm_info $cm, $contextid, $userid, $after = false) {
         // No level 4.
         return false;
diff --git a/mod/quiz/classes/analytics/indicator/social_breadth.php b/mod/quiz/classes/analytics/indicator/social_breadth.php
index dd323fb33564f..6259a4e832ed3 100644
--- a/mod/quiz/classes/analytics/indicator/social_breadth.php
+++ b/mod/quiz/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthquiz', 'mod_quiz');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 2;
     }
diff --git a/mod/resource/classes/analytics/indicator/activity_base.php b/mod/resource/classes/analytics/indicator/activity_base.php
index 074cf866717b7..8e8627a0a37a2 100644
--- a/mod/resource/classes/analytics/indicator/activity_base.php
+++ b/mod/resource/classes/analytics/indicator/activity_base.php
@@ -34,5 +34,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 abstract class activity_base extends \core_analytics\local\indicator\community_of_inquiry_activity {
-
 }
diff --git a/mod/resource/classes/analytics/indicator/cognitive_depth.php b/mod/resource/classes/analytics/indicator/cognitive_depth.php
index 3358f681f2df9..25bc096c54a27 100644
--- a/mod/resource/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/resource/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthresource', 'mod_resource');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_cognitive_depth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/resource/classes/analytics/indicator/social_breadth.php b/mod/resource/classes/analytics/indicator/social_breadth.php
index 93149e6f9a645..9637e46681ccc 100644
--- a/mod/resource/classes/analytics/indicator/social_breadth.php
+++ b/mod/resource/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthresource', 'mod_resource');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/scorm/classes/analytics/indicator/activity_base.php b/mod/scorm/classes/analytics/indicator/activity_base.php
index 5f146a0d8e796..75a6ace56c218 100644
--- a/mod/scorm/classes/analytics/indicator/activity_base.php
+++ b/mod/scorm/classes/analytics/indicator/activity_base.php
@@ -35,6 +35,11 @@
  */
 abstract class activity_base extends \core_analytics\local\indicator\community_of_inquiry_activity {
 
+    /**
+     * feedback_viewed_events
+     *
+     * @return string[]
+     */
     protected function feedback_viewed_events() {
         // Any view after the data graded counts as feedback viewed.
         return array('\mod_scorm\event\course_module_viewed');
diff --git a/mod/scorm/classes/analytics/indicator/cognitive_depth.php b/mod/scorm/classes/analytics/indicator/cognitive_depth.php
index f46947ff3f43d..82d43b5bdab8c 100644
--- a/mod/scorm/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/scorm/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthscorm', 'mod_scorm');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     public function get_cognitive_depth_level(\cm_info $cm) {
         return 3;
     }
diff --git a/mod/scorm/classes/analytics/indicator/social_breadth.php b/mod/scorm/classes/analytics/indicator/social_breadth.php
index 34247f55ae066..d431652a22805 100644
--- a/mod/scorm/classes/analytics/indicator/social_breadth.php
+++ b/mod/scorm/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthscorm', 'mod_scorm');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 2;
     }
diff --git a/mod/survey/classes/analytics/indicator/activity_base.php b/mod/survey/classes/analytics/indicator/activity_base.php
index 0bbe5870bef7d..d6f39d484b293 100644
--- a/mod/survey/classes/analytics/indicator/activity_base.php
+++ b/mod/survey/classes/analytics/indicator/activity_base.php
@@ -34,5 +34,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 abstract class activity_base extends \core_analytics\local\indicator\community_of_inquiry_activity {
-
 }
diff --git a/mod/survey/classes/analytics/indicator/cognitive_depth.php b/mod/survey/classes/analytics/indicator/cognitive_depth.php
index bb648458218d5..9e8e5e122c088 100644
--- a/mod/survey/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/survey/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthsurvey', 'mod_survey');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_cognitive_depth_level(\cm_info $cm) {
         return 2;
     }
diff --git a/mod/survey/classes/analytics/indicator/social_breadth.php b/mod/survey/classes/analytics/indicator/social_breadth.php
index 4becdd381638f..483458b1395fc 100644
--- a/mod/survey/classes/analytics/indicator/social_breadth.php
+++ b/mod/survey/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthsurvey', 'mod_survey');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/url/classes/analytics/indicator/activity_base.php b/mod/url/classes/analytics/indicator/activity_base.php
index e0b3b93423387..82bc6b9c199f2 100644
--- a/mod/url/classes/analytics/indicator/activity_base.php
+++ b/mod/url/classes/analytics/indicator/activity_base.php
@@ -34,5 +34,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 abstract class activity_base extends \core_analytics\local\indicator\community_of_inquiry_activity {
-
 }
diff --git a/mod/url/classes/analytics/indicator/cognitive_depth.php b/mod/url/classes/analytics/indicator/cognitive_depth.php
index ee11328c1103b..9c68162475f1b 100644
--- a/mod/url/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/url/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthurl', 'mod_url');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_cognitive_depth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/url/classes/analytics/indicator/social_breadth.php b/mod/url/classes/analytics/indicator/social_breadth.php
index 109bd06c40f63..48c6f0b88490d 100644
--- a/mod/url/classes/analytics/indicator/social_breadth.php
+++ b/mod/url/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthurl', 'mod_url');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/wiki/classes/analytics/indicator/activity_base.php b/mod/wiki/classes/analytics/indicator/activity_base.php
index 2a740a72fbf78..cd262464efb8d 100644
--- a/mod/wiki/classes/analytics/indicator/activity_base.php
+++ b/mod/wiki/classes/analytics/indicator/activity_base.php
@@ -34,5 +34,4 @@
  * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 abstract class activity_base extends \core_analytics\local\indicator\community_of_inquiry_activity {
-
 }
diff --git a/mod/wiki/classes/analytics/indicator/cognitive_depth.php b/mod/wiki/classes/analytics/indicator/cognitive_depth.php
index 3fae42032e7bd..fd4a47a7b492f 100644
--- a/mod/wiki/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/wiki/classes/analytics/indicator/cognitive_depth.php
@@ -35,14 +35,30 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthwiki', 'mod_wiki');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     public function get_cognitive_depth_level(\cm_info $cm) {
         return 2;
     }
diff --git a/mod/wiki/classes/analytics/indicator/social_breadth.php b/mod/wiki/classes/analytics/indicator/social_breadth.php
index 44670ab03e995..a02018d97ed54 100644
--- a/mod/wiki/classes/analytics/indicator/social_breadth.php
+++ b/mod/wiki/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthwiki', 'mod_wiki');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 1;
     }
diff --git a/mod/workshop/classes/analytics/indicator/activity_base.php b/mod/workshop/classes/analytics/indicator/activity_base.php
index 1816fa514b5ac..1774d6357ed62 100644
--- a/mod/workshop/classes/analytics/indicator/activity_base.php
+++ b/mod/workshop/classes/analytics/indicator/activity_base.php
@@ -35,10 +35,20 @@
  */
 abstract class activity_base extends \core_analytics\local\indicator\community_of_inquiry_activity {
 
+    /**
+     * feedback_check_grades
+     *
+     * @return bool
+     */
     protected function feedback_check_grades() {
         return true;
     }
 
+    /**
+     * feedback_viewed_events
+     *
+     * @return string[]
+     */
     protected function feedback_viewed_events() {
         return array('\mod_workshop\event\course_module_viewed', '\mod_workshop\event\submission_viewed');
     }
diff --git a/mod/workshop/classes/analytics/indicator/cognitive_depth.php b/mod/workshop/classes/analytics/indicator/cognitive_depth.php
index d84150d5de314..e55d0a5379a38 100644
--- a/mod/workshop/classes/analytics/indicator/cognitive_depth.php
+++ b/mod/workshop/classes/analytics/indicator/cognitive_depth.php
@@ -35,24 +35,50 @@
  */
 class cognitive_depth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:cognitivedepthworkshop', 'mod_workshop');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_COGNITIVE;
     }
 
+    /**
+     * get_cognitive_depth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     public function get_cognitive_depth_level(\cm_info $cm) {
         return 5;
     }
 
+    /**
+     * feedback_replied_events
+     *
+     * @return string[]
+     */
     protected function feedback_replied_events() {
         return array('\mod_workshop\event\submission_assessed', '\mod_workshop\event\submission_reassessed');
     }
 
+    /**
+     * feedback_submitted_events
+     *
+     * @return string[]
+     */
     protected function feedback_submitted_events() {
-        // Can't use assessable_uploaded instead of submission_* as mod_workshop only triggers it during submission_updated
+        // Can't use assessable_uploaded instead of submission_* as mod_workshop only triggers it during submission_updated.
         return array('\mod_workshop\event\submission_updated', '\mod_workshop\event\submission_created',
             '\mod_workshop\event\submission_reassessed');
     }
diff --git a/mod/workshop/classes/analytics/indicator/social_breadth.php b/mod/workshop/classes/analytics/indicator/social_breadth.php
index 8c7de48464abd..dca70fd7aee18 100644
--- a/mod/workshop/classes/analytics/indicator/social_breadth.php
+++ b/mod/workshop/classes/analytics/indicator/social_breadth.php
@@ -35,14 +35,30 @@
  */
 class social_breadth extends activity_base {
 
+    /**
+     * get_name
+     *
+     * @return string
+     */
     public static function get_name() {
         return get_string('indicator:socialbreadthworkshop', 'mod_workshop');
     }
 
+    /**
+     * get_indicator_type
+     *
+     * @return string
+     */
     protected function get_indicator_type() {
         return self::INDICATOR_SOCIAL;
     }
 
+    /**
+     * get_social_breadth_level
+     *
+     * @param \cm_info $cm
+     * @return int
+     */
     protected function get_social_breadth_level(\cm_info $cm) {
         return 2;
     }
diff --git a/report/insights/classes/output/insight.php b/report/insights/classes/output/insight.php
index 20ad9203fb0f8..51b7fe652b883 100644
--- a/report/insights/classes/output/insight.php
+++ b/report/insights/classes/output/insight.php
@@ -50,6 +50,14 @@ class insight implements \renderable, \templatable {
      */
     protected $includedetailsaction = false;
 
+    /**
+     * Constructor
+     *
+     * @param \core_analytics\prediction $prediction
+     * @param \core_analytics\model $model
+     * @param bool $includedetailsaction
+     * @return void
+     */
     public function __construct(\core_analytics\prediction $prediction, \core_analytics\model $model, $includedetailsaction = false) {
         $this->prediction = $prediction;
         $this->model = $model;
diff --git a/report/insights/classes/output/insights_list.php b/report/insights/classes/output/insights_list.php
index 97e311c196082..8968f0d8e594d 100644
--- a/report/insights/classes/output/insights_list.php
+++ b/report/insights/classes/output/insights_list.php
@@ -46,10 +46,18 @@ class insights_list implements \renderable, \templatable {
     protected $context;
 
     /**
-     * @var \core_analytics\model
+     * @var \core_analytics\model[]
      */
     protected $othermodels;
 
+    /**
+     * Constructor
+     *
+     * @param \core_analytics\model $model
+     * @param \context $context
+     * @param \core_analytics\model[] $othermodels
+     * @return void
+     */
     public function __construct(\core_analytics\model $model, \context $context, $othermodels) {
         $this->model = $model;
         $this->context = $context;
diff --git a/report/insights/lib.php b/report/insights/lib.php
index c6e3b83ba62e3..aee031f1afe1e 100644
--- a/report/insights/lib.php
+++ b/report/insights/lib.php
@@ -30,6 +30,7 @@
  * @param navigation_node $navigation The navigation node to extend
  * @param stdClass        $course     The course to object for the tool
  * @param context         $context    The context of the course
+ * @return void
  */
 function report_insights_extend_navigation_course($navigation, $course, $context) {
     global $DB;
diff --git a/user/classes/analytics/indicator/user_profile_set.php b/user/classes/analytics/indicator/user_profile_set.php
new file mode 100644
index 0000000000000..f9a6aa75d72ce
--- /dev/null
+++ b/user/classes/analytics/indicator/user_profile_set.php
@@ -0,0 +1,99 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * User profile set indicator.
+ *
+ * @package   core_user
+ * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace core_user\analytics\indicator;
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * User profile set indicator.
+ *
+ * @package   core_user
+ * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class user_profile_set extends \core_analytics\local\indicator\linear {
+
+    /**
+     * get_name
+     *
+     * @return string
+     */
+    public static function get_name() {
+        return get_string('indicator:completeduserprofile');
+    }
+
+    /**
+     * required_sample_data
+     *
+     * @return string[]
+     */
+    public static function required_sample_data() {
+        return array('user');
+    }
+
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param string $sampleorigin
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
+    protected function calculate_sample($sampleid, $sampleorigin, $starttime = false, $endtime = false) {
+        global $CFG;
+
+        $user = $this->retrieve('user', $sampleid);
+
+        // Nothing set results in -1.
+        $calculatedvalue = self::MIN_VALUE;
+
+        if (!empty($CFG->sitepolicy) && !$user->policyagreed) {
+            return self::MIN_VALUE;
+        }
+
+        if (!$user->confirmed) {
+            return self::MIN_VALUE;
+        }
+
+        if ($user->description != '') {
+            $calculatedvalue += 1;
+        }
+
+        if ($user->picture != '') {
+            $calculatedvalue += 1;
+        }
+
+        // 0.2 for any of the following fields being set (some of them may even be compulsory or have a default).
+        $fields = array('institution', 'department', 'address', 'city', 'country', 'url');
+        foreach ($fields as $fieldname) {
+            if ($user->{$fieldname} != '') {
+                $calculatedvalue += 0.2;
+            }
+        }
+
+        return $this->limit_value($calculatedvalue);
+    }
+}
diff --git a/user/classes/analytics/indicator/user_track_forums.php b/user/classes/analytics/indicator/user_track_forums.php
new file mode 100644
index 0000000000000..29b4e76dee648
--- /dev/null
+++ b/user/classes/analytics/indicator/user_track_forums.php
@@ -0,0 +1,69 @@
+<?php
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * User tracks forums indicator.
+ *
+ * @package   core_user
+ * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace core_user\analytics\indicator;
+
+defined('MOODLE_INTERNAL') || die();
+
+/**
+ * User tracks forums indicator.
+ *
+ * @package   core_user
+ * @copyright 2016 David Monllao {@link http://www.davidmonllao.com}
+ * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class user_track_forums extends \core_analytics\local\indicator\binary {
+
+    /**
+     * get_name
+     *
+     * @return string
+     */
+    public static function get_name() {
+        return get_string('indicator:userforumstracking');
+    }
+
+    /**
+     * required_sample_data
+     *
+     * @return string[]
+     */
+    public static function required_sample_data() {
+        return array('user');
+    }
+
+    /**
+     * calculate_sample
+     *
+     * @param int $sampleid
+     * @param string $samplesorigin
+     * @param int $starttime
+     * @param int $endtime
+     * @return float
+     */
+    protected function calculate_sample($sampleid, $samplesorigin, $starttime = false, $endtime = false) {
+        $user = $this->retrieve('user', $sampleid);
+        return ($user->trackforums) ? self::get_max_value() : self::get_min_value();
+    }
+}