protected function getNextStep($event = null)
{
if (!$event) {
$event = $this->event;
}
if ($assignment = models\OphCiExamination_Event_ElementSet_Assignment::model()->find('event_id = ?', array($event->id))) {
$step = $assignment->step;
} else {
$step = $this->getFirstStep();
}
return $step->getNextStep();
}