The referee and assistant referees should wear black or white clothing/shoes and avoid reserved colors for the ball, the goals, and player markings in their clothing. The referee and his/her assistants will be close to but off the field during play. The referee and the assistants may enter the field in particular situations, e.g. to reposition the robot when applying a penalty or stuck. The referee and his/her assistants should avoid interfering with the robots as much as possible.