diff --git a/mod/lesson/classes/privacy/provider.php b/mod/lesson/classes/privacy/provider.php
new file mode 100644
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+++ b/mod/lesson/classes/privacy/provider.php
@@ -0,0 +1,584 @@
+<?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/>.
+
+/**
+ * Data provider.
+ *
+ * @package    mod_lesson
+ * @copyright  2018 Frédéric Massart
+ * @author     Frédéric Massart <fred@branchup.tech>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+namespace mod_lesson\privacy;
+defined('MOODLE_INTERNAL') || die();
+
+use context;
+use context_helper;
+use context_module;
+use stdClass;
+use core_privacy\local\metadata\collection;
+use core_privacy\local\request\approved_contextlist;
+use core_privacy\local\request\helper;
+use core_privacy\local\request\transform;
+use core_privacy\local\request\writer;
+
+require_once($CFG->dirroot . '/mod/lesson/locallib.php');
+require_once($CFG->dirroot . '/mod/lesson/pagetypes/essay.php');
+require_once($CFG->dirroot . '/mod/lesson/pagetypes/matching.php');
+require_once($CFG->dirroot . '/mod/lesson/pagetypes/multichoice.php');
+
+/**
+ * Data provider class.
+ *
+ * @package    mod_lesson
+ * @copyright  2018 Frédéric Massart
+ * @author     Frédéric Massart <fred@branchup.tech>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class provider implements
+    \core_privacy\local\metadata\provider,
+    \core_privacy\local\request\plugin\provider,
+    \core_privacy\local\request\user_preference_provider {
+
+    /**
+     * Returns metadata.
+     *
+     * @param collection $collection The initialised collection to add items to.
+     * @return collection A listing of user data stored through this system.
+     */
+    public static function get_metadata(collection $collection) : collection {
+        $collection->add_database_table('lesson_attempts', [
+            'userid' => 'privacy:metadata:attempts:userid',
+            'pageid' => 'privacy:metadata:attempts:pageid',
+            'answerid' => 'privacy:metadata:attempts:answerid',
+            'retry' => 'privacy:metadata:attempts:retry',
+            'correct' => 'privacy:metadata:attempts:correct',
+            'useranswer' => 'privacy:metadata:attempts:useranswer',
+            'timeseen' => 'privacy:metadata:attempts:timeseen',
+        ], 'privacy:metadata:attempts');
+
+        $collection->add_database_table('lesson_grades', [
+            'userid' => 'privacy:metadata:grades:userid',
+            'grade' => 'privacy:metadata:grades:grade',
+            'completed' => 'privacy:metadata:grades:completed',
+            // The column late is not used.
+        ], 'privacy:metadata:grades');
+
+        $collection->add_database_table('lesson_timer', [
+            'userid' => 'privacy:metadata:timer:userid',
+            'starttime' => 'privacy:metadata:timer:starttime',
+            'lessontime' => 'privacy:metadata:timer:lessontime',
+            'completed' => 'privacy:metadata:timer:completed',
+            'timemodifiedoffline' => 'privacy:metadata:timer:timemodifiedoffline',
+        ], 'privacy:metadata:timer');
+
+        $collection->add_database_table('lesson_branch', [
+            'userid' => 'privacy:metadata:branch:userid',
+            'pageid' => 'privacy:metadata:branch:pageid',
+            'retry' => 'privacy:metadata:branch:retry',
+            'flag' => 'privacy:metadata:branch:flag',
+            'timeseen' => 'privacy:metadata:branch:timeseen',
+            'nextpageid' => 'privacy:metadata:branch:nextpageid',
+        ], 'privacy:metadata:branch');
+
+        $collection->add_database_table('lesson_overrides', [
+            'userid' => 'privacy:metadata:overrides:userid',
+            'available' => 'privacy:metadata:overrides:available',
+            'deadline' => 'privacy:metadata:overrides:deadline',
+            'timelimit' => 'privacy:metadata:overrides:timelimit',
+            'review' => 'privacy:metadata:overrides:review',
+            'maxattempts' => 'privacy:metadata:overrides:maxattempts',
+            'retake' => 'privacy:metadata:overrides:retake',
+            'password' => 'privacy:metadata:overrides:password',
+        ], 'privacy:metadata:overrides');
+
+        $collection->add_user_preference('lesson_view', 'privacy:metadata:userpref:lessonview');
+
+        return $collection;
+    }
+
+    /**
+     * Get the list of contexts that contain user information for the specified user.
+     *
+     * @param int $userid The user to search.
+     * @return contextlist $contextlist The contextlist containing the list of contexts used in this plugin.
+     */
+    public static function get_contexts_for_userid(int $userid) : \core_privacy\local\request\contextlist {
+        $contextlist = new \core_privacy\local\request\contextlist();
+
+        $sql = "
+            SELECT DISTINCT ctx.id
+              FROM {lesson} l
+              JOIN {modules} m
+                ON m.name = :lesson
+              JOIN {course_modules} cm
+                ON cm.instance = l.id
+               AND cm.module = m.id
+              JOIN {context} ctx
+                ON ctx.instanceid = cm.id
+               AND ctx.contextlevel = :modulelevel
+         LEFT JOIN {lesson_attempts} la
+                ON la.lessonid = l.id
+         LEFT JOIN {lesson_branch} lb
+                ON lb.lessonid = l.id
+         LEFT JOIN {lesson_grades} lg
+                ON lg.lessonid = l.id
+         LEFT JOIN {lesson_overrides} lo
+                ON lo.lessonid = l.id
+         LEFT JOIN {lesson_timer} lt
+                ON lt.lessonid = l.id
+             WHERE la.userid = :userid1
+                OR lb.userid = :userid2
+                OR lg.userid = :userid3
+                OR lt.userid = :userid4
+                OR lo.userid = :userid5";
+
+        $params = [
+            'lesson' => 'lesson',
+            'modulelevel' => CONTEXT_MODULE,
+            'userid1' => $userid,
+            'userid2' => $userid,
+            'userid3' => $userid,
+            'userid4' => $userid,
+            'userid5' => $userid,
+        ];
+        $contextlist->add_from_sql($sql, $params);
+
+        return $contextlist;
+    }
+
+    /**
+     * Export all user data for the specified user, in the specified contexts.
+     *
+     * @param approved_contextlist $contextlist The approved contexts to export information for.
+     */
+    public static function export_user_data(approved_contextlist $contextlist) {
+        global $DB;
+
+        $user = $contextlist->get_user();
+        $userid = $user->id;
+        $cmids = array_reduce($contextlist->get_contexts(), function($carry, $context) {
+            if ($context->contextlevel == CONTEXT_MODULE) {
+                $carry[] = $context->instanceid;
+            }
+            return $carry;
+        }, []);
+        if (empty($cmids)) {
+            return;
+        }
+
+        // If the context export was requested, then let's at least describe the lesson.
+        foreach ($cmids as $cmid) {
+            $context = context_module::instance($cmid);
+            $contextdata = helper::get_context_data($context, $user);
+            helper::export_context_files($context, $user);
+            writer::with_context($context)->export_data([], $contextdata);
+        }
+
+        // Find the lesson IDs.
+        $lessonidstocmids = static::get_lesson_ids_to_cmids_from_cmids($cmids);
+
+        // Prepare the common SQL fragments.
+        list($inlessonsql, $inlessonparams) = $DB->get_in_or_equal(array_keys($lessonidstocmids), SQL_PARAMS_NAMED);
+        $sqluserlesson = "userid = :userid AND lessonid $inlessonsql";
+        $paramsuserlesson = array_merge($inlessonparams, ['userid' => $userid]);
+
+        // Export the overrides.
+        $recordset = $DB->get_recordset_select('lesson_overrides', $sqluserlesson, $paramsuserlesson);
+        static::recordset_loop_and_export($recordset, 'lessonid', null, function($carry, $record) {
+            // We know that there is only one row per lesson, so no need to use $carry.
+            return (object) [
+                'available' => $record->available !== null ? transform::datetime($record->available) : null,
+                'deadline' => $record->deadline !== null ? transform::datetime($record->deadline) : null,
+                'timelimit' => $record->timelimit !== null ? format_time($record->timelimit) : null,
+                'review' => $record->review !== null ? transform::yesno($record->review) : null,
+                'maxattempts' => $record->maxattempts,
+                'retake' => $record->retake !== null ? transform::yesno($record->retake) : null,
+                'password' => $record->password,
+            ];
+        }, function($lessonid, $data) use ($lessonidstocmids) {
+            $context = context_module::instance($lessonidstocmids[$lessonid]);
+            writer::with_context($context)->export_related_data([], 'overrides', $data);
+        });
+
+        // Export the grades.
+        $recordset = $DB->get_recordset_select('lesson_grades', $sqluserlesson, $paramsuserlesson, 'lessonid, completed');
+        static::recordset_loop_and_export($recordset, 'lessonid', [], function($carry, $record) {
+            $carry[] = (object) [
+                'grade' => $record->grade,
+                'completed' => transform::datetime($record->completed),
+            ];
+            return $carry;
+        }, function($lessonid, $data) use ($lessonidstocmids) {
+            $context = context_module::instance($lessonidstocmids[$lessonid]);
+            writer::with_context($context)->export_related_data([], 'grades', (object) ['grades' => $data]);
+        });
+
+        // Export the timers.
+        $recordset = $DB->get_recordset_select('lesson_timer', $sqluserlesson, $paramsuserlesson, 'lessonid, starttime');
+        static::recordset_loop_and_export($recordset, 'lessonid', [], function($carry, $record) {
+            $carry[] = (object) [
+                'starttime' => transform::datetime($record->starttime),
+                'lastactivity' => transform::datetime($record->lessontime),
+                'completed' => transform::yesno($record->completed),
+                'timemodifiedoffline' => $record->timemodifiedoffline ? transform::datetime($record->timemodifiedoffline) : null,
+            ];
+            return $carry;
+        }, function($lessonid, $data) use ($lessonidstocmids) {
+            $context = context_module::instance($lessonidstocmids[$lessonid]);
+            writer::with_context($context)->export_related_data([], 'timers', (object) ['timers' => $data]);
+        });
+
+        // Export the attempts and branches.
+        $sql = "
+            SELECT " . $DB->sql_concat('lp.id', "':'", 'COALESCE(la.id, 0)', "':'", 'COALESCE(lb.id, 0)') . " AS uniqid,
+                   lp.lessonid,
+
+                   lp.id AS page_id,
+                   lp.qtype AS page_qtype,
+                   lp.qoption AS page_qoption,
+                   lp.title AS page_title,
+                   lp.contents AS page_contents,
+                   lp.contentsformat AS page_contentsformat,
+
+                   la.id AS attempt_id,
+                   la.retry AS attempt_retry,
+                   la.correct AS attempt_correct,
+                   la.useranswer AS attempt_useranswer,
+                   la.timeseen AS attempt_timeseen,
+
+                   lb.id AS branch_id,
+                   lb.retry AS branch_retry,
+                   lb.timeseen AS branch_timeseen,
+
+                   lpb.id AS nextpage_id,
+                   lpb.title AS nextpage_title
+
+              FROM {lesson_pages} lp
+         LEFT JOIN {lesson_attempts} la
+                ON la.pageid = lp.id
+               AND la.userid = :userid1
+         LEFT JOIN {lesson_branch} lb
+                ON lb.pageid = lp.id
+               AND lb.userid = :userid2
+         LEFT JOIN {lesson_pages} lpb
+                ON lpb.id = lb.nextpageid
+             WHERE lp.lessonid $inlessonsql
+               AND (la.id IS NOT NULL OR lb.id IS NOT NULL)
+          ORDER BY lp.lessonid, lp.id, la.retry, lb.retry, la.id, lb.id";
+        $params = array_merge($inlessonparams, ['userid1' => $userid, 'userid2' => $userid]);
+
+        $recordset = $DB->get_recordset_sql($sql, $params);
+        static::recordset_loop_and_export($recordset, 'lessonid', [], function($carry, $record) use ($lessonidstocmids) {
+            $context = context_module::instance($lessonidstocmids[$record->lessonid]);
+            $options = ['context' => $context];
+
+            $take = isset($record->attempt_retry) ? $record->attempt_retry : $record->branch_retry;
+            if (!isset($carry[$take])) {
+                $carry[$take] = (object) [
+                    'number' => $take + 1,
+                    'answers' => [],
+                    'jumps' => []
+                ];
+            }
+
+            $pagefilespath = [get_string('privacy:path:pages', 'mod_lesson'), $record->page_id];
+            writer::with_context($context)->export_area_files($pagefilespath, 'mod_lesson', 'page_contents', $record->page_id);
+            $pagecontents = format_text(
+                writer::with_context($context)->rewrite_pluginfile_urls(
+                    $pagefilespath,
+                    'mod_lesson',
+                    'page_contents',
+                    $record->page_id,
+                    $record->page_contents
+                ),
+                $record->page_contentsformat,
+                $options
+            );
+
+            $pagebase = [
+                'id' => $record->page_id,
+                'page' => $record->page_title,
+                'contents' => $pagecontents,
+                'contents_files_folder' => implode('/', $pagefilespath)
+            ];
+
+            if (isset($record->attempt_id)) {
+                $carry[$take]->answers[] = array_merge($pagebase, static::transform_attempt($record, $context));
+
+            } else if (isset($record->branch_id)) {
+                if (!empty($record->nextpage_id)) {
+                    $wentto = $record->nextpage_title . " (id: {$record->nextpage_id})";
+                } else {
+                    $wentto = get_string('endoflesson', 'mod_lesson');
+                }
+                $carry[$take]->jumps[] = array_merge($pagebase, [
+                    'went_to' => $wentto,
+                    'timeseen' => transform::datetime($record->attempt_timeseen)
+                ]);
+            }
+
+            return $carry;
+
+        }, function($lessonid, $data) use ($lessonidstocmids) {
+            $context = context_module::instance($lessonidstocmids[$lessonid]);
+            writer::with_context($context)->export_related_data([], 'attempts', (object) [
+                'attempts' => array_values($data)
+            ]);
+        });
+    }
+
+    /**
+     * Export all user preferences for the plugin.
+     *
+     * @param int $userid The userid of the user whose data is to be exported.
+     */
+    public static function export_user_preferences(int $userid) {
+        $lessonview = get_user_preferences('lesson_view', null, $userid);
+        if ($lessonview !== null) {
+            $value = $lessonview;
+
+            // The code seems to indicate that there also is the option 'simple', but it's not
+            // described nor accessible from anywhere so we won't describe it more than being 'simple'.
+            if ($lessonview == 'full') {
+                $value = get_string('full', 'mod_lesson');
+            } else if ($lessonview == 'collapsed') {
+                $value = get_string('collapsed', 'mod_lesson');
+            }
+
+            writer::export_user_preference('mod_lesson', 'lesson_view', $lessonview,
+                get_string('privacy:metadata:userpref:lessonview', 'mod_lesson'));
+        }
+    }
+
+    /**
+     * Delete all data for all users in the specified context.
+     *
+     * @param context $context The specific context to delete data for.
+     */
+    public static function delete_data_for_all_users_in_context(context $context) {
+        global $DB;
+
+        if ($context->contextlevel != CONTEXT_MODULE) {
+            return;
+        }
+
+        $lessonid = static::get_lesson_id_from_context($context);
+
+        $DB->delete_records('lesson_attempts', ['lessonid' => $lessonid]);
+        $DB->delete_records('lesson_branch', ['lessonid' => $lessonid]);
+        $DB->delete_records('lesson_grades', ['lessonid' => $lessonid]);
+        $DB->delete_records('lesson_timer', ['lessonid' => $lessonid]);
+        $DB->delete_records_select('lesson_overrides', 'lessonid = :id AND userid IS NOT NULL', ['id' => $lessonid]);
+
+        $fs = get_file_storage();
+        $fs->delete_area_files($context->id, 'mod_lesson', 'essay_responses');
+    }
+
+    /**
+     * Delete all user data for the specified user, in the specified contexts.
+     *
+     * @param approved_contextlist $contextlist The approved contexts and user information to delete information for.
+     */
+    public static function delete_data_for_user(approved_contextlist $contextlist) {
+        global $DB;
+
+        $userid = $contextlist->get_user()->id;
+        $cmids = array_reduce($contextlist->get_contexts(), function($carry, $context) {
+            if ($context->contextlevel == CONTEXT_MODULE) {
+                $carry[] = $context->instanceid;
+            }
+            return $carry;
+        }, []);
+        if (empty($cmids)) {
+            return;
+        }
+
+        // Find the lesson IDs.
+        $lessonidstocmids = static::get_lesson_ids_to_cmids_from_cmids($cmids);
+        $lessonids = array_keys($lessonidstocmids);
+        if (empty($lessonids)) {
+            return;
+        }
+
+        // Prepare the SQL we'll need below.
+        list($insql, $inparams) = $DB->get_in_or_equal($lessonids, SQL_PARAMS_NAMED);
+        $sql = "lessonid $insql AND userid = :userid";
+        $params = array_merge($inparams, ['userid' => $userid]);
+
+        // Delete the attempt files.
+        $fs = get_file_storage();
+        $recordset = $DB->get_recordset_select('lesson_attempts', $sql, $params, '', 'id, lessonid');
+        foreach ($recordset as $record) {
+            $cmid = $lessonidstocmids[$record->lessonid];
+            $context = context_module::instance($cmid);
+            $fs->delete_area_files($context->id, 'mod_lesson', 'essay_responses', $record->id);
+        }
+        $recordset->close();
+
+        // Delete all the things.
+        $DB->delete_records_select('lesson_attempts', $sql, $params);
+        $DB->delete_records_select('lesson_branch', $sql, $params);
+        $DB->delete_records_select('lesson_grades', $sql, $params);
+        $DB->delete_records_select('lesson_timer', $sql, $params);
+        $DB->delete_records_select('lesson_overrides', $sql, $params);
+    }
+
+    /**
+     * Get a survey ID from its context.
+     *
+     * @param context_module $context The module context.
+     * @return int
+     */
+    protected static function get_lesson_id_from_context(context_module $context) {
+        $cm = get_coursemodule_from_id('lesson', $context->instanceid);
+        return $cm ? (int) $cm->instance : 0;
+    }
+
+    /**
+     * Return a dict of lesson IDs mapped to their course module ID.
+     *
+     * @param array $cmids The course module IDs.
+     * @return array In the form of [$lessonid => $cmid].
+     */
+    protected static function get_lesson_ids_to_cmids_from_cmids(array $cmids) {
+        global $DB;
+        list($insql, $inparams) = $DB->get_in_or_equal($cmids, SQL_PARAMS_NAMED);
+        $sql = "
+            SELECT l.id, cm.id AS cmid
+              FROM {lesson} l
+              JOIN {modules} m
+                ON m.name = :lesson
+              JOIN {course_modules} cm
+                ON cm.instance = l.id
+               AND cm.module = m.id
+             WHERE cm.id $insql";
+        $params = array_merge($inparams, ['lesson' => 'lesson']);
+        return $DB->get_records_sql_menu($sql, $params);
+    }
+
+    /**
+     * Loop and export from a recordset.
+     *
+     * @param moodle_recordset $recordset The recordset.
+     * @param string $splitkey The record key to determine when to export.
+     * @param mixed $initial The initial data to reduce from.
+     * @param callable $reducer The function to return the dataset, receives current dataset, and the current record.
+     * @param callable $export The function to export the dataset, receives the last value from $splitkey and the dataset.
+     * @return void
+     */
+    protected static function recordset_loop_and_export(\moodle_recordset $recordset, $splitkey, $initial,
+            callable $reducer, callable $export) {
+
+        $data = $initial;
+        $lastid = null;
+
+        foreach ($recordset as $record) {
+            if ($lastid && $record->{$splitkey} != $lastid) {
+                $export($lastid, $data);
+                $data = $initial;
+            }
+            $data = $reducer($data, $record);
+            $lastid = $record->{$splitkey};
+        }
+        $recordset->close();
+
+        if (!empty($lastid)) {
+            $export($lastid, $data);
+        }
+    }
+
+    /**
+     * Transform an attempt.
+     *
+     * @param stdClass $data Data from the database, as per the exporting method.
+     * @param context_module $context The module context.
+     * @return array
+     */
+    protected static function transform_attempt(stdClass $data, context_module $context) {
+        global $DB;
+
+        $options = ['context' => $context];
+        $answer = $data->attempt_useranswer;
+        $response = null;
+        $responsefilesfolder = null;
+
+        if ($answer !== null) {
+            if ($data->page_qtype == LESSON_PAGE_ESSAY) {
+                // Essay questions serialise data in the answer field.
+                $info = \lesson_page_type_essay::extract_useranswer($answer);
+                $answer = format_text($info->answer, $info->answerformat, $options);
+                if ($info->response !== null) {
+                    // We export the files in a subfolder to avoid conflicting files, and tell the user
+                    // where those files were exported. That is because we are not using a subfolder for
+                    // every single essay response.
+                    $responsefilespath = [get_string('privacy:path:essayresponses', 'mod_lesson'), $data->attempt_id];
+                    $responsefilesfolder = implode('/', $responsefilespath);
+                    $response = format_text(
+                        writer::with_context($context)->rewrite_pluginfile_urls(
+                            $responsefilespath,
+                            'mod_lesson',
+                            'essay_responses',
+                            $data->attempt_id,
+                            $info->response
+                        ),
+                        $info->responseformat,
+                        $options
+                    );
+                    writer::with_context($context)->export_area_files($responsefilespath, 'mod_lesson',
+                        'essay_responses', $data->page_id);
+                }
+
+            } else if ($data->page_qtype == LESSON_PAGE_MULTICHOICE && $data->page_qoption) {
+                // Multiple choice quesitons with multiple answers encode the answers.
+                list($insql, $inparams) = $DB->get_in_or_equal(explode(',', $answer), SQL_PARAMS_NAMED);
+                $records = $DB->get_records_select('lesson_answers', "id $insql", $inparams, 'id, answer, answerformat');
+                $answer = array_values(array_map(function($record) use ($options) {
+                    return format_text($record->answer, $record->answerformat, $options);
+                }, empty($records) ? [] : $records));
+
+            } else if ($data->page_qtype == LESSON_PAGE_MATCHING) {
+                // Matching questions need sorting.
+                $chosen = explode(',', $answer);
+                $answers = $DB->get_records_select('lesson_answers', 'pageid = :pageid', ['pageid' => $data->page_id],
+                    'id', 'id, answer, answerformat', 2); // The two first entries are not options.
+                $i = -1;
+                $answer = array_values(array_map(function($record) use (&$i, $chosen, $options) {
+                    $i++;
+                    return [
+                        'label' => format_text($record->answer, $record->answerformat, $options),
+                        'matched_with' => array_key_exists($i, $chosen) ? $chosen[$i] : null
+                    ];
+                }, empty($answers) ? [] : $answers));
+            }
+        }
+
+        $result = [
+            'answer' => $answer,
+            'correct' => transform::yesno($data->attempt_correct),
+            'timeseen' => transform::datetime($data->attempt_timeseen),
+        ];
+
+        if ($response !== null) {
+            $result['response'] = $response;
+            $result['response_files_folder'] = $responsefilesfolder;
+        }
+
+        return $result;
+    }
+
+}
diff --git a/mod/lesson/lang/en/lesson.php b/mod/lesson/lang/en/lesson.php
index 52cf7865209..286811d0bd4 100644
--- a/mod/lesson/lang/en/lesson.php
+++ b/mod/lesson/lang/en/lesson.php
@@ -438,6 +438,43 @@ $string['preview'] = 'Preview';
 $string['previewlesson'] = 'Preview {$a}';
 $string['previewpagenamed'] = 'Preview page: {$a}';
 $string['previouspage'] = 'Previous page';
+$string['privacy:metadata:attempts:userid'] = 'The user ID';
+$string['privacy:metadata:attempts:pageid'] = 'The page ID';
+$string['privacy:metadata:attempts:answerid'] = 'The answer ID';
+$string['privacy:metadata:attempts:retry'] = 'The attempt number';
+$string['privacy:metadata:attempts:correct'] = 'Whether the attempt was correct';
+$string['privacy:metadata:attempts:useranswer'] = 'Details about the user\'s answer';
+$string['privacy:metadata:attempts:timeseen'] = 'Time at which the attempt was made';
+$string['privacy:metadata:attempts'] = 'A record of page attempts';
+$string['privacy:metadata:grades:userid'] = 'The user ID';
+$string['privacy:metadata:grades:grade'] = 'The grade given';
+$string['privacy:metadata:grades:completed'] = 'The date at which the grade was given';
+$string['privacy:metadata:grades'] = 'A record of the grades for each lesson';
+$string['privacy:metadata:timer:userid'] = 'The user ID';
+$string['privacy:metadata:timer:starttime'] = 'The date at which the attempt started';
+$string['privacy:metadata:timer:lessontime'] = 'The last moment when we recorded activity';
+$string['privacy:metadata:timer:completed'] = 'Whether the attempt is complete';
+$string['privacy:metadata:timer:timemodifiedoffline'] = 'The last moment when we recorded activity from the mobile app';
+$string['privacy:metadata:timer'] = 'A record of a lesson attempt';
+$string['privacy:metadata:branch:userid'] = 'The user ID';
+$string['privacy:metadata:branch:pageid'] = 'The page ID';
+$string['privacy:metadata:branch:retry'] = 'The attempt number';
+$string['privacy:metadata:branch:flag'] = 'Whether the next page was calculated randomely';
+$string['privacy:metadata:branch:timeseen'] = 'Time at which the page was viewed ';
+$string['privacy:metadata:branch:nextpageid'] = 'The next page ID';
+$string['privacy:metadata:branch'] = 'A record of the pages viewed';
+$string['privacy:metadata:overrides:userid'] = 'The user ID';
+$string['privacy:metadata:overrides:available'] = 'Time at which the students can start attempting the lesson';
+$string['privacy:metadata:overrides:deadline'] = 'Time by which students must have completed their attempt';
+$string['privacy:metadata:overrides:timelimit'] = 'Time limit to complete the lesson, in seconds.';
+$string['privacy:metadata:overrides:review'] = 'Whether trying a question again is allowed';
+$string['privacy:metadata:overrides:maxattempts'] = 'The maximium number of attempts';
+$string['privacy:metadata:overrides:retake'] = 'Whether re-takes are allowed';
+$string['privacy:metadata:overrides:password'] = 'The password to access the lesson';
+$string['privacy:metadata:overrides'] = 'A record of overrides per lesson';
+$string['privacy:metadata:userpref:lessonview'] = 'The preferred display mode when editing lessons';
+$string['privacy:path:essayresponses'] = 'Essay responses';
+$string['privacy:path:pages'] = 'Pages';
 $string['processerror'] = 'Error occurred during processing!';
 $string['progressbar'] = 'Progress bar';
 $string['progressbar_help'] = 'If enabled, a bar is displayed at the bottom of lesson pages showing approximate percentage of completion.';
diff --git a/mod/lesson/tests/privacy_test.php b/mod/lesson/tests/privacy_test.php
new file mode 100644
index 00000000000..896aa673f8c
--- /dev/null
+++ b/mod/lesson/tests/privacy_test.php
@@ -0,0 +1,756 @@
+<?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/>.
+
+/**
+ * Data provider tests.
+ *
+ * @package    mod_lesson
+ * @category   test
+ * @copyright  2018 Frédéric Massart
+ * @author     Frédéric Massart <fred@branchup.tech>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+defined('MOODLE_INTERNAL') || die();
+global $CFG;
+
+use core_privacy\tests\provider_testcase;
+use core_privacy\local\request\approved_contextlist;
+use core_privacy\local\request\transform;
+use core_privacy\local\request\writer;
+use mod_lesson\privacy\provider;
+
+/**
+ * Data provider testcase class.
+ *
+ * @package    mod_lesson
+ * @category   test
+ * @copyright  2018 Frédéric Massart
+ * @author     Frédéric Massart <fred@branchup.tech>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+class mod_lesson_privacy_testcase extends provider_testcase {
+
+    public function setUp() {
+        global $PAGE;
+        $this->setAdminUser();  // The data generator complains without this.
+        $this->resetAfterTest();
+        $PAGE->get_renderer('core');
+    }
+
+    public function test_get_contexts_for_userid() {
+        $dg = $this->getDataGenerator();
+        $c1 = $dg->create_course();
+
+        $u1 = $dg->create_user();
+        $u2 = $dg->create_user();
+        $u3 = $dg->create_user();
+        $u4 = $dg->create_user();
+        $u5 = $dg->create_user();
+        $u6 = $dg->create_user();
+
+        $cm1 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm2 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm3 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm1ctx = context_module::instance($cm1->cmid);
+        $cm2ctx = context_module::instance($cm2->cmid);
+        $cm3ctx = context_module::instance($cm3->cmid);
+
+        $this->create_attempt($cm1, $u1);
+        $this->create_grade($cm2, $u2);
+        $this->create_timer($cm3, $u3);
+        $this->create_branch($cm2, $u4);
+        $this->create_override($cm1, $u5);
+
+        $this->create_attempt($cm2, $u6);
+        $this->create_grade($cm2, $u6);
+        $this->create_timer($cm1, $u6);
+        $this->create_branch($cm2, $u6);
+        $this->create_override($cm3, $u6);
+
+        $contextids = provider::get_contexts_for_userid($u1->id)->get_contextids();
+        $this->assertCount(1, $contextids);
+        $this->assertTrue(in_array($cm1ctx->id, $contextids));
+
+        $contextids = provider::get_contexts_for_userid($u2->id)->get_contextids();
+        $this->assertCount(1, $contextids);
+        $this->assertTrue(in_array($cm2ctx->id, $contextids));
+
+        $contextids = provider::get_contexts_for_userid($u3->id)->get_contextids();
+        $this->assertCount(1, $contextids);
+        $this->assertTrue(in_array($cm3ctx->id, $contextids));
+
+        $contextids = provider::get_contexts_for_userid($u4->id)->get_contextids();
+        $this->assertCount(1, $contextids);
+        $this->assertTrue(in_array($cm2ctx->id, $contextids));
+
+        $contextids = provider::get_contexts_for_userid($u5->id)->get_contextids();
+        $this->assertCount(1, $contextids);
+        $this->assertTrue(in_array($cm1ctx->id, $contextids));
+
+        $contextids = provider::get_contexts_for_userid($u6->id)->get_contextids();
+        $this->assertCount(3, $contextids);
+        $this->assertTrue(in_array($cm1ctx->id, $contextids));
+        $this->assertTrue(in_array($cm2ctx->id, $contextids));
+        $this->assertTrue(in_array($cm3ctx->id, $contextids));
+    }
+
+    public function test_delete_data_for_all_users_in_context() {
+        global $DB;
+        $dg = $this->getDataGenerator();
+        $c1 = $dg->create_course();
+        $u1 = $dg->create_user();
+        $u2 = $dg->create_user();
+
+        $cm1 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm2 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm3 = $dg->create_module('lesson', ['course' => $c1]);
+
+        $c1ctx = context_course::instance($c1->id);
+        $cm1ctx = context_module::instance($cm1->cmid);
+        $cm2ctx = context_module::instance($cm2->cmid);
+        $cm3ctx = context_module::instance($cm3->cmid);
+
+        $this->create_attempt($cm1, $u1);
+        $this->create_grade($cm1, $u1);
+        $this->create_timer($cm1, $u1);
+        $this->create_branch($cm1, $u1);
+        $this->create_override($cm1, $u1);
+
+        $this->create_attempt($cm1, $u2);
+        $this->create_grade($cm1, $u2);
+        $this->create_timer($cm1, $u2);
+        $this->create_branch($cm1, $u2);
+        $this->create_override($cm1, $u2);
+
+        $this->create_attempt($cm2, $u1);
+        $this->create_grade($cm2, $u1);
+        $this->create_timer($cm2, $u1);
+        $this->create_branch($cm2, $u1);
+        $this->create_override($cm2, $u1);
+        $this->create_attempt($cm2, $u2);
+        $this->create_grade($cm2, $u2);
+        $this->create_timer($cm2, $u2);
+        $this->create_branch($cm2, $u2);
+        $this->create_override($cm2, $u2);
+
+        $assertcm1nochange = function() use ($DB, $u1, $u2, $cm1) {
+            $this->assertTrue($DB->record_exists('lesson_attempts', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_grades', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_timer', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_branch', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_overrides', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_attempts', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_grades', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_timer', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_branch', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_overrides', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+        };
+        $assertcm2nochange = function() use ($DB, $u1, $u2, $cm2) {
+            $this->assertTrue($DB->record_exists('lesson_attempts', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_grades', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_timer', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_branch', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_overrides', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_attempts', ['userid' => $u2->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_grades', ['userid' => $u2->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_timer', ['userid' => $u2->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_branch', ['userid' => $u2->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_overrides', ['userid' => $u2->id, 'lessonid' => $cm2->id]));
+        };
+
+        // Confirm existing state.
+        $assertcm1nochange();
+        $assertcm2nochange();
+
+        // Delete the course: no change.
+        provider::delete_data_for_all_users_in_context(context_course::instance($c1->id));
+        $assertcm1nochange();
+        $assertcm2nochange();
+
+        // Delete another module: no change.
+        provider::delete_data_for_all_users_in_context(context_module::instance($cm3->cmid));
+        $assertcm1nochange();
+        $assertcm2nochange();
+
+        // Delete cm1: no change in cm2.
+        provider::delete_data_for_all_users_in_context(context_module::instance($cm1->cmid));
+        $assertcm2nochange();
+        $this->assertFalse($DB->record_exists('lesson_attempts', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+        $this->assertFalse($DB->record_exists('lesson_grades', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+        $this->assertFalse($DB->record_exists('lesson_timer', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+        $this->assertFalse($DB->record_exists('lesson_branch', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+        $this->assertFalse($DB->record_exists('lesson_overrides', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+        $this->assertFalse($DB->record_exists('lesson_attempts', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+        $this->assertFalse($DB->record_exists('lesson_grades', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+        $this->assertFalse($DB->record_exists('lesson_timer', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+        $this->assertFalse($DB->record_exists('lesson_branch', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+        $this->assertFalse($DB->record_exists('lesson_overrides', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+    }
+
+    public function test_delete_data_for_user() {
+        global $DB;
+        $dg = $this->getDataGenerator();
+        $c1 = $dg->create_course();
+        $u1 = $dg->create_user();
+        $u2 = $dg->create_user();
+
+        $cm1 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm2 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm3 = $dg->create_module('lesson', ['course' => $c1]);
+
+        $c1ctx = context_course::instance($c1->id);
+        $cm1ctx = context_module::instance($cm1->cmid);
+        $cm2ctx = context_module::instance($cm2->cmid);
+        $cm3ctx = context_module::instance($cm3->cmid);
+
+        $this->create_attempt($cm1, $u1);
+        $this->create_grade($cm1, $u1);
+        $this->create_timer($cm1, $u1);
+        $this->create_branch($cm1, $u1);
+        $this->create_override($cm1, $u1);
+        $this->create_attempt($cm1, $u2);
+        $this->create_grade($cm1, $u2);
+        $this->create_timer($cm1, $u2);
+        $this->create_branch($cm1, $u2);
+        $this->create_override($cm1, $u2);
+
+        $this->create_attempt($cm2, $u1);
+        $this->create_grade($cm2, $u1);
+        $this->create_timer($cm2, $u1);
+        $this->create_branch($cm2, $u1);
+        $this->create_override($cm2, $u1);
+        $this->create_attempt($cm2, $u2);
+        $this->create_grade($cm2, $u2);
+        $this->create_timer($cm2, $u2);
+        $this->create_branch($cm2, $u2);
+        $this->create_override($cm2, $u2);
+
+        $assertu1nochange = function() use ($DB, $u1, $cm1, $cm2) {
+            $this->assertTrue($DB->record_exists('lesson_attempts', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_grades', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_timer', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_branch', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_overrides', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_attempts', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_grades', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_timer', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_branch', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_overrides', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+        };
+        $assertu2nochange = function() use ($DB, $u2, $cm1, $cm2) {
+            $this->assertTrue($DB->record_exists('lesson_attempts', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_grades', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_timer', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_branch', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_overrides', ['userid' => $u2->id, 'lessonid' => $cm1->id]));
+            $this->assertTrue($DB->record_exists('lesson_attempts', ['userid' => $u2->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_grades', ['userid' => $u2->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_timer', ['userid' => $u2->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_branch', ['userid' => $u2->id, 'lessonid' => $cm2->id]));
+            $this->assertTrue($DB->record_exists('lesson_overrides', ['userid' => $u2->id, 'lessonid' => $cm2->id]));
+        };
+
+        // Confirm existing state.
+        $assertu1nochange();
+        $assertu2nochange();
+
+        // Delete the course: no change.
+        provider::delete_data_for_user(new approved_contextlist($u1, 'mod_lesson', [context_course::instance($c1->id)->id]));
+        $assertu1nochange();
+        $assertu2nochange();
+
+        // Delete another module: no change.
+        provider::delete_data_for_user(new approved_contextlist($u1, 'mod_lesson', [context_module::instance($cm3->cmid)->id]));
+        $assertu1nochange();
+        $assertu2nochange();
+
+        // Delete u1 in cm1: no change for u2 and in cm2.
+        provider::delete_data_for_user(new approved_contextlist($u1, 'mod_lesson', [context_module::instance($cm1->cmid)->id]));
+        $assertu2nochange();
+        $this->assertFalse($DB->record_exists('lesson_attempts', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+        $this->assertFalse($DB->record_exists('lesson_grades', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+        $this->assertFalse($DB->record_exists('lesson_timer', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+        $this->assertFalse($DB->record_exists('lesson_branch', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+        $this->assertFalse($DB->record_exists('lesson_overrides', ['userid' => $u1->id, 'lessonid' => $cm1->id]));
+        $this->assertTrue($DB->record_exists('lesson_attempts', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+        $this->assertTrue($DB->record_exists('lesson_grades', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+        $this->assertTrue($DB->record_exists('lesson_timer', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+        $this->assertTrue($DB->record_exists('lesson_branch', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+        $this->assertTrue($DB->record_exists('lesson_overrides', ['userid' => $u1->id, 'lessonid' => $cm2->id]));
+    }
+
+    public function test_export_data_for_user_overrides() {
+        $dg = $this->getDataGenerator();
+        $c1 = $dg->create_course();
+        $u1 = $dg->create_user();
+        $u2 = $dg->create_user();
+
+        $cm1 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm2 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm1ctx = context_module::instance($cm1->cmid);
+        $cm2ctx = context_module::instance($cm2->cmid);
+
+        $now = time();
+        $this->create_override($cm1, $u1); // All null.
+        $this->create_override($cm2, $u1, [
+            'available' => $now - 3600,
+            'deadline' => $now + 3600,
+            'timelimit' => 123,
+            'review' => 1,
+            'maxattempts' => 1,
+            'retake' => 0,
+            'password' => '1337 5p34k'
+        ]);
+        $this->create_override($cm1, $u2, [
+            'available' => $now - 1230,
+            'timelimit' => 456,
+            'maxattempts' => 5,
+            'retake' => 1,
+        ]);
+
+        provider::export_user_data(new approved_contextlist($u1, 'mod_lesson', [$cm1ctx->id, $cm2ctx->id]));
+        $data = writer::with_context($cm1ctx)->get_data([]);
+        $this->assertNotEmpty($data);
+        $data = writer::with_context($cm1ctx)->get_related_data([], 'overrides');
+        $this->assertNull($data->available);
+        $this->assertNull($data->deadline);
+        $this->assertNull($data->timelimit);
+        $this->assertNull($data->review);
+        $this->assertNull($data->maxattempts);
+        $this->assertNull($data->retake);
+        $this->assertNull($data->password);
+
+        $data = writer::with_context($cm2ctx)->get_data([]);
+        $this->assertNotEmpty($data);
+        $data = writer::with_context($cm2ctx)->get_related_data([], 'overrides');
+        $this->assertEquals(transform::datetime($now - 3600), $data->available);
+        $this->assertEquals(transform::datetime($now + 3600), $data->deadline);
+        $this->assertEquals(format_time(123), $data->timelimit);
+        $this->assertEquals(transform::yesno(true), $data->review);
+        $this->assertEquals(1, $data->maxattempts);
+        $this->assertEquals(transform::yesno(false), $data->retake);
+        $this->assertEquals('1337 5p34k', $data->password);
+
+        writer::reset();
+        provider::export_user_data(new approved_contextlist($u2, 'mod_lesson', [$cm1ctx->id, $cm2ctx->id]));
+        $data = writer::with_context($cm1ctx)->get_data([]);
+        $this->assertNotEmpty($data);
+        $data = writer::with_context($cm1ctx)->get_related_data([], 'overrides');
+        $this->assertEquals(transform::datetime($now - 1230), $data->available);
+        $this->assertNull($data->deadline);
+        $this->assertEquals(format_time(456), $data->timelimit);
+        $this->assertNull($data->review);
+        $this->assertEquals(5, $data->maxattempts);
+        $this->assertEquals(transform::yesno(true), $data->retake);
+        $this->assertNull($data->password);
+
+        $data = writer::with_context($cm2ctx)->get_data([]);
+        $this->assertNotEmpty($data);
+        $data = writer::with_context($cm2ctx)->get_related_data([], 'overrides');
+        $this->assertEmpty($data);
+    }
+
+    public function test_export_data_for_user_grades() {
+        $dg = $this->getDataGenerator();
+        $c1 = $dg->create_course();
+        $u1 = $dg->create_user();
+        $u2 = $dg->create_user();
+
+        $cm1 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm2 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm1ctx = context_module::instance($cm1->cmid);
+        $cm2ctx = context_module::instance($cm2->cmid);
+
+        $now = time();
+        $this->create_grade($cm2, $u1, ['grade' => 33.33, 'completed' => $now - 3600]);
+        $this->create_grade($cm2, $u1, ['grade' => 50, 'completed' => $now - 1600]);
+        $this->create_grade($cm2, $u1, ['grade' => 81.23, 'completed' => $now - 100]);
+        $this->create_grade($cm1, $u2, ['grade' => 99.98, 'completed' => $now - 86400]);
+
+        provider::export_user_data(new approved_contextlist($u1, 'mod_lesson', [$cm1ctx->id, $cm2ctx->id]));
+        $data = writer::with_context($cm1ctx)->get_related_data([], 'grades');
+        $this->assertEmpty($data);
+        $data = writer::with_context($cm2ctx)->get_related_data([], 'grades');
+        $this->assertNotEmpty($data);
+        $this->assertCount(3, $data->grades);
+        $this->assertEquals(33.33, $data->grades[0]->grade);
+        $this->assertEquals(50, $data->grades[1]->grade);
+        $this->assertEquals(81.23, $data->grades[2]->grade);
+        $this->assertEquals(transform::datetime($now - 3600), $data->grades[0]->completed);
+        $this->assertEquals(transform::datetime($now - 1600), $data->grades[1]->completed);
+        $this->assertEquals(transform::datetime($now - 100), $data->grades[2]->completed);
+
+        writer::reset();
+        provider::export_user_data(new approved_contextlist($u2, 'mod_lesson', [$cm1ctx->id, $cm2ctx->id]));
+        $data = writer::with_context($cm2ctx)->get_related_data([], 'grades');
+        $this->assertEmpty($data);
+        $data = writer::with_context($cm1ctx)->get_related_data([], 'grades');
+        $this->assertNotEmpty($data);
+        $this->assertCount(1, $data->grades);
+        $this->assertEquals(99.98, $data->grades[0]->grade);
+        $this->assertEquals(transform::datetime($now - 86400), $data->grades[0]->completed);
+    }
+
+    public function test_export_data_for_user_timers() {
+        $dg = $this->getDataGenerator();
+        $c1 = $dg->create_course();
+        $u1 = $dg->create_user();
+        $u2 = $dg->create_user();
+
+        $cm1 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm2 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm1ctx = context_module::instance($cm1->cmid);
+        $cm2ctx = context_module::instance($cm2->cmid);
+
+        $now = time();
+        $this->create_timer($cm2, $u1, ['starttime' => $now - 2000, 'lessontime' => $now + 3600, 'completed' => 0,
+            'timemodifiedoffline' => $now - 7000]);
+        $this->create_timer($cm2, $u1, ['starttime' => $now - 1000, 'lessontime' => $now + 1600, 'completed' => 0]);
+        $this->create_timer($cm2, $u1, ['starttime' => $now - 500, 'lessontime' => $now + 100, 'completed' => 1]);
+        $this->create_timer($cm1, $u2, ['starttime' => $now - 1000, 'lessontime' => $now + 1800, 'completed' => 1]);
+
+        provider::export_user_data(new approved_contextlist($u1, 'mod_lesson', [$cm1ctx->id, $cm2ctx->id]));
+        $data = writer::with_context($cm1ctx)->get_related_data([], 'timers');
+        $this->assertEmpty($data);
+        $data = writer::with_context($cm2ctx)->get_related_data([], 'timers');
+        $this->assertNotEmpty($data);
+        $this->assertCount(3, $data->timers);
+        $this->assertEquals(transform::datetime($now - 2000), $data->timers[0]->starttime);
+        $this->assertEquals(transform::datetime($now + 3600), $data->timers[0]->lastactivity);
+        $this->assertEquals(transform::yesno(false), $data->timers[0]->completed);
+        $this->assertEquals(transform::datetime($now - 7000), $data->timers[0]->timemodifiedoffline);
+
+        $this->assertEquals(transform::datetime($now - 1000), $data->timers[1]->starttime);
+        $this->assertEquals(transform::datetime($now + 1600), $data->timers[1]->lastactivity);
+        $this->assertEquals(transform::yesno(false), $data->timers[1]->completed);
+        $this->assertNull($data->timers[1]->timemodifiedoffline);
+
+        $this->assertEquals(transform::datetime($now - 500), $data->timers[2]->starttime);
+        $this->assertEquals(transform::datetime($now + 100), $data->timers[2]->lastactivity);
+        $this->assertEquals(transform::yesno(true), $data->timers[2]->completed);
+        $this->assertNull($data->timers[2]->timemodifiedoffline);
+
+        writer::reset();
+        provider::export_user_data(new approved_contextlist($u2, 'mod_lesson', [$cm1ctx->id, $cm2ctx->id]));
+        $data = writer::with_context($cm2ctx)->get_related_data([], 'timers');
+        $this->assertEmpty($data);
+        $data = writer::with_context($cm1ctx)->get_related_data([], 'timers');
+        $this->assertCount(1, $data->timers);
+        $this->assertEquals(transform::datetime($now - 1000), $data->timers[0]->starttime);
+        $this->assertEquals(transform::datetime($now + 1800), $data->timers[0]->lastactivity);
+        $this->assertEquals(transform::yesno(true), $data->timers[0]->completed);
+        $this->assertNull($data->timers[0]->timemodifiedoffline);
+    }
+
+    public function test_export_data_for_user_attempts() {
+        global $DB;
+        $dg = $this->getDataGenerator();
+        $lg = $dg->get_plugin_generator('mod_lesson');
+
+        $c1 = $dg->create_course();
+        $u1 = $dg->create_user();
+        $u2 = $dg->create_user();
+
+        $cm1 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm2 = $dg->create_module('lesson', ['course' => $c1]);
+        $cm1ctx = context_module::instance($cm1->cmid);
+        $cm2ctx = context_module::instance($cm2->cmid);
+
+        $page1 = $lg->create_content($cm1);
+        $page2 = $lg->create_question_truefalse($cm1);
+        $page3 = $lg->create_question_multichoice($cm1);
+        $page4 = $lg->create_question_multichoice($cm1, [
+            'qoption' => 1,
+            'answer_editor' => [
+                ['text' => 'Cats', 'format' => FORMAT_PLAIN, 'score' => 1],
+                ['text' => 'Dogs', 'format' => FORMAT_PLAIN, 'score' => 1],
+                ['text' => 'Birds', 'format' => FORMAT_PLAIN, 'score' => 0],
+            ],
+            'jumpto' => [LESSON_NEXTPAGE, LESSON_NEXTPAGE, LESSON_THISPAGE]
+        ]);
+        $page4answers = array_keys($DB->get_records('lesson_answers', ['pageid' => $page4->id], 'id'));
+        $page5 = $lg->create_question_matching($cm1, [
+            'answer_editor' => [
+                2 => ['text' => 'The plural of cat', 'format' => FORMAT_PLAIN],
+                3 => ['text' => 'The plural of dog', 'format' => FORMAT_PLAIN],
+                4 => ['text' => 'The plural of bird', 'format' => FORMAT_PLAIN],
+            ],
+            'response_editor' => [
+                2 => 'Cats',
+                3 => 'Dogs',
+                4 => 'Birds',
+            ]
+        ]);
+        $page6 = $lg->create_question_shortanswer($cm1);
+        $page7 = $lg->create_question_numeric($cm1);
+        $page8 = $lg->create_question_essay($cm1);
+        $page9 = $lg->create_content($cm1);
+
+        $pageb1 = $lg->create_content($cm2);
+        $pageb2 = $lg->create_question_truefalse($cm2);
+        $pageb3 = $lg->create_question_truefalse($cm2);
+
+        $this->create_branch($cm1, $u1, ['pageid' => $page1->id, 'nextpageid' => $page2->id]);
+        $this->create_attempt($cm1, $u1, ['pageid' => $page2->id, 'useranswer' => 'This is true']);
+        $this->create_attempt($cm1, $u1, ['pageid' => $page3->id, 'useranswer' => 'A', 'correct' => 1]);
+        $this->create_attempt($cm1, $u1, ['pageid' => $page4->id,
+            'useranswer' => implode(',', array_slice($page4answers, 0, 2))]);
+        $this->create_attempt($cm1, $u1, ['pageid' => $page5->id, 'useranswer' => 'Cats,Birds,Dogs']);
+        $this->create_attempt($cm1, $u1, ['pageid' => $page6->id, 'useranswer' => 'Hello world!']);
+        $this->create_attempt($cm1, $u1, ['pageid' => $page7->id, 'useranswer' => '1337']);
+        $this->create_attempt($cm1, $u1, ['pageid' => $page8->id, 'useranswer' => serialize((object) [
+            'sent' => 0, 'graded' => 0, 'score' => 0, 'answer' => 'I like cats', 'answerformat' => FORMAT_PLAIN,
+            'response' => 'Me too!', 'responseformat' => FORMAT_PLAIN
+        ])]);
+        $this->create_branch($cm1, $u1, ['pageid' => $page9->id, 'nextpageid' => 0]);
+
+        provider::export_user_data(new approved_contextlist($u1, 'mod_lesson', [$cm1ctx->id, $cm2ctx->id]));
+        $data = writer::with_context($cm2ctx)->get_related_data([], 'attempts');
+        $this->assertEmpty($data);
+        $data = writer::with_context($cm1ctx)->get_related_data([], 'attempts');
+        $this->assertNotEmpty($data);
+        $this->assertCount(1, $data->attempts);
+        $this->assertEquals(1, $data->attempts[0]->number);
+        $this->assertCount(2, $data->attempts[0]->jumps);
+        $this->assertCount(7, $data->attempts[0]->answers);
+        $jump = $data->attempts[0]->jumps[0];
+        $this->assert_attempt_page($page1, $jump);
+        $this->assertTrue(strpos($jump['went_to'], $page2->title) !== false);
+        $jump = $data->attempts[0]->jumps[1];
+        $this->assert_attempt_page($page9, $jump);
+        $this->assertEquals(get_string('endoflesson', 'mod_lesson'), $jump['went_to']);
+        $answer = $data->attempts[0]->answers[0];
+        $this->assert_attempt_page($page2, $answer);
+        $this->assertEquals(transform::yesno(false), $answer['correct']);
+        $this->assertEquals('This is true', $answer['answer']);
+        $answer = $data->attempts[0]->answers[1];
+        $this->assert_attempt_page($page3, $answer);
+        $this->assertEquals(transform::yesno(true), $answer['correct']);
+        $this->assertEquals('A', $answer['answer']);
+        $answer = $data->attempts[0]->answers[2];
+        $this->assert_attempt_page($page4, $answer);
+        $this->assertEquals(transform::yesno(false), $answer['correct']);
+        $this->assertCount(2, $answer['answer']);
+        $this->assertTrue(in_array('Cats', $answer['answer']));
+        $this->assertTrue(in_array('Dogs', $answer['answer']));
+        $answer = $data->attempts[0]->answers[3];
+        $this->assert_attempt_page($page5, $answer);
+        $this->assertEquals(transform::yesno(false), $answer['correct']);
+        $this->assertCount(3, $answer['answer']);
+        $this->assertEquals('The plural of cat', $answer['answer'][0]['label']);
+        $this->assertEquals('Cats', $answer['answer'][0]['matched_with']);
+        $this->assertEquals('The plural of dog', $answer['answer'][1]['label']);
+        $this->assertEquals('Birds', $answer['answer'][1]['matched_with']);
+        $this->assertEquals('The plural of bird', $answer['answer'][2]['label']);
+        $this->assertEquals('Dogs', $answer['answer'][2]['matched_with']);
+        $answer = $data->attempts[0]->answers[4];
+        $this->assert_attempt_page($page6, $answer);
+        $this->assertEquals(transform::yesno(false), $answer['correct']);
+        $this->assertEquals('Hello world!', $answer['answer']);
+        $answer = $data->attempts[0]->answers[5];
+        $this->assert_attempt_page($page7, $answer);
+        $this->assertEquals(transform::yesno(false), $answer['correct']);
+        $this->assertEquals('1337', $answer['answer']);
+        $answer = $data->attempts[0]->answers[6];
+        $this->assert_attempt_page($page8, $answer);
+        $this->assertEquals(transform::yesno(false), $answer['correct']);
+        $this->assertEquals('I like cats', $answer['answer']);
+        $this->assertEquals('Me too!', $answer['response']);
+
+        writer::reset();
+        provider::export_user_data(new approved_contextlist($u2, 'mod_lesson', [$cm1ctx->id, $cm2ctx->id]));
+        $data = writer::with_context($cm1ctx)->get_related_data([], 'attempts');
+        $this->assertEmpty($data);
+        $data = writer::with_context($cm2ctx)->get_related_data([], 'attempts');
+        $this->assertEmpty($data);
+
+        // Let's mess with the data by creating an additional attempt for u1, and create data for u1 and u2 in the other cm.
+        $this->create_branch($cm1, $u1, ['pageid' => $page1->id, 'nextpageid' => $page3->id, 'retry' => 1]);
+        $this->create_attempt($cm1, $u1, ['pageid' => $page3->id, 'useranswer' => 'B', 'retry' => 1]);
+
+        $this->create_branch($cm2, $u1, ['pageid' => $pageb1->id, 'nextpageid' => $pageb2->id]);
+        $this->create_attempt($cm2, $u1, ['pageid' => $pageb2->id, 'useranswer' => 'Abc']);
+
+        $this->create_branch($cm2, $u2, ['pageid' => $pageb1->id, 'nextpageid' => $pageb3->id]);
+        $this->create_attempt($cm2, $u2, ['pageid' => $pageb3->id, 'useranswer' => 'Def']);
+
+        writer::reset();
+        provider::export_user_data(new approved_contextlist($u1, 'mod_lesson', [$cm1ctx->id, $cm2ctx->id]));
+        $data = writer::with_context($cm1ctx)->get_related_data([], 'attempts');
+        $this->assertNotEmpty($data);
+        $this->assertCount(2, $data->attempts);
+        $this->assertEquals(1, $data->attempts[0]->number);
+        $this->assertCount(2, $data->attempts[0]->jumps);
+        $this->assertCount(7, $data->attempts[0]->answers);
+        $attempt = $data->attempts[1];
+        $this->assertEquals(2, $attempt->number);
+        $this->assertCount(1, $attempt->jumps);
+        $this->assertCount(1, $attempt->answers);
+        $this->assert_attempt_page($page1, $attempt->jumps[0]);
+        $this->assertTrue(strpos($attempt->jumps[0]['went_to'], $page3->title) !== false);
+        $this->assert_attempt_page($page3, $attempt->answers[0]);
+        $this->assertEquals('B', $attempt->answers[0]['answer']);
+
+        $data = writer::with_context($cm2ctx)->get_related_data([], 'attempts');
+        $this->assertCount(1, $data->attempts);
+        $attempt = $data->attempts[0];
+        $this->assertEquals(1, $attempt->number);
+        $this->assertCount(1, $attempt->jumps);
+        $this->assertCount(1, $attempt->answers);
+        $this->assert_attempt_page($pageb1, $attempt->jumps[0]);
+        $this->assertTrue(strpos($attempt->jumps[0]['went_to'], $pageb2->title) !== false);
+        $this->assert_attempt_page($pageb2, $attempt->answers[0]);
+        $this->assertEquals('Abc', $attempt->answers[0]['answer']);
+
+        writer::reset();
+        provider::export_user_data(new approved_contextlist($u2, 'mod_lesson', [$cm1ctx->id, $cm2ctx->id]));
+        $data = writer::with_context($cm1ctx)->get_related_data([], 'attempts');
+        $this->assertEmpty($data);
+
+        $data = writer::with_context($cm2ctx)->get_related_data([], 'attempts');
+        $this->assertCount(1, $data->attempts);
+        $attempt = $data->attempts[0];
+        $this->assertEquals(1, $attempt->number);
+        $this->assertCount(1, $attempt->jumps);
+        $this->assertCount(1, $attempt->answers);
+        $this->assert_attempt_page($pageb1, $attempt->jumps[0]);
+        $this->assertTrue(strpos($attempt->jumps[0]['went_to'], $pageb3->title) !== false);
+        $this->assert_attempt_page($pageb3, $attempt->answers[0]);
+        $this->assertEquals('Def', $attempt->answers[0]['answer']);
+    }
+
+    /**
+     * Assert the page details of an attempt.
+     *
+     * @param object $page The expected page info.
+     * @param array $attempt The exported attempt details.
+     * @return void
+     */
+    protected function assert_attempt_page($page, $attempt) {
+        $this->assertEquals($page->id, $attempt['id']);
+        $this->assertEquals($page->title, $attempt['page']);
+        $this->assertEquals(format_text($page->contents, $page->contentsformat), $attempt['contents']);
+    }
+
+    /**
+     * Create an attempt (answer to a question).
+     *
+     * @param object $lesson The lesson.
+     * @param object $user The user.
+     * @param array $options Options.
+     * @return object
+     */
+    protected function create_attempt($lesson, $user, array $options = []) {
+        global $DB;
+        $record = (object) array_merge([
+            'lessonid' => $lesson->id,
+            'userid' => $user->id,
+            'pageid' => 0,
+            'answerid' => 0,
+            'retry' => 0,
+            'correct' => 0,
+            'useranswer' => '',
+            'timeseen' => time(),
+        ], $options);
+        $record->id = $DB->insert_record('lesson_attempts', $record);
+        return $record;
+    }
+
+    /**
+     * Create a grade.
+     *
+     * @param object $lesson The lesson.
+     * @param object $user The user.
+     * @param array $options Options.
+     * @return object
+     */
+    protected function create_grade($lesson, $user, array $options = []) {
+        global $DB;
+        $record = (object) array_merge([
+            'lessonid' => $lesson->id,
+            'userid' => $user->id,
+            'late' => 0,
+            'grade' => 50.0,
+            'completed' => time(),
+        ], $options);
+        $record->id = $DB->insert_record('lesson_grades', $record);
+        return $record;
+    }
+
+    /**
+     * Create a timer.
+     *
+     * @param object $lesson The lesson.
+     * @param object $user The user.
+     * @param array $options Options.
+     * @return object
+     */
+    protected function create_timer($lesson, $user, array $options = []) {
+        global $DB;
+        $record = (object) array_merge([
+            'lessonid' => $lesson->id,
+            'userid' => $user->id,
+            'starttime' => time() - 600,
+            'lessontime' => time(),
+            'completed' => 1,
+            'timemodifiedoffline' => 0,
+        ], $options);
+        $record->id = $DB->insert_record('lesson_timer', $record);
+        return $record;
+    }
+
+    /**
+     * Create a branch (choice on page).
+     *
+     * @param object $lesson The lesson.
+     * @param object $user The user.
+     * @param array $options Options.
+     * @return object
+     */
+    protected function create_branch($lesson, $user, array $options = []) {
+        global $DB;
+        $record = (object) array_merge([
+            'lessonid' => $lesson->id,
+            'userid' => $user->id,
+            'pageid' => 0,
+            'retry' => 0,
+            'flag' => 0,
+            'timeseen' => time(),
+            'nextpageid' => 0,
+        ], $options);
+        $record->id = $DB->insert_record('lesson_branch', $record);
+        return $record;
+    }
+
+    /**
+     * Create an override.
+     *
+     * @param object $lesson The lesson.
+     * @param object $user The user.
+     * @param array $options Options.
+     * @return object
+     */
+    protected function create_override($lesson, $user, array $options = []) {
+        global $DB;
+        $record = (object) array_merge([
+            'lessonid' => $lesson->id,
+            'userid' => $user->id,
+        ], $options);
+        $record->id = $DB->insert_record('lesson_overrides', $record);
+        return $record;
+    }
+}