public static function asArray()
    {
        return array(
            'AUTHOR' => self::AUTHOR,
            'CANDIDATE' => self::CANDIDATE,
            'PROCTOR' => self::PROCTOR,
            'SCORER' => self::SCORER,
            'TEST_CONSTRUCTOR' => self::TEST_CONSTRUCTOR,
            'TUTOR' => self::TUTOR
        );
    }