function getCompletedItems(){
		if(empty($this->id) || empty($this->task_id)){
			$this->error = "SI_TaskActivity::getCompletedItems(): Invalid Task!\n";
			return FALSE;
		}

		$ti = new SI_TaskItem();
		$items = $ti->getCompletedTaskItems($this->task_id, $this->id);
		if($items === FALSE){
			$this->error = "SI_TaskActivity::getCompletedItems(): Error getting items:\n".$ti->getLastError();
			return FALSE;
		}else{
			$this->completed_items = $items;
		}

		return TRUE;
	}