/**
     * Get info about 
     * @param object $sco_item_ids
     * @param object $a_obj_id
     * @return 
     */
    public static function _getProgressInfo($sco_item_ids, $a_obj_id)
    {
        global $ilDB;
        $in = $ilDB->in('sco_id', $sco_item_ids, false, 'integer');
        $res = $ilDB->queryF('
		SELECT * FROM scorm_tracking 
		WHERE ' . $in . '
		AND obj_id = %s 
		AND lvalue = %s ', array('integer', 'text'), array($a_obj_id, 'cmi.core.lesson_status'));
        $info['completed'] = array();
        $info['failed'] = array();
        $user_ids = array();
        while ($row = $ilDB->fetchObject($res)) {
            switch ($row->rvalue) {
                case 'completed':
                case 'passed':
                    $info['completed'][$row->sco_id][] = $row->user_id;
                    $user_ids[] = $row->user_id;
                    break;
                case 'failed':
                    $info['failed'][$row->sco_id][] = $row->user_id;
                    $user_ids[] = $row->user_id;
                    break;
            }
        }
        $info['in_progress'] = ilObjSCORMTracking::_getInProgress($sco_item_ids, $a_obj_id, $user_ids);
        return $info;
    }