protected function gatherLPUsers() { include_once "Services/Tracking/classes/class.ilLPMarks.php"; $user_ids = ilLPMarks::_getAllUserIds($this->obj_id); include_once "Services/Tracking/classes/class.ilChangeEvent.php"; $user_ids = array_merge($user_ids, ilChangeEvent::_getAllUserIds($this->obj_id)); return $user_ids; }