63 In what situations is the VAR employed in a football match? In football, referees also have the option to use an on-field review system (on-field VAR), placed in a designated area next to the pitch. The use of the on-field VAR can be decided by the referees themselves, when they have doubts on a decision they have made, or requested by assistant referees, in case they detect a clear mistake in a decision made by the referee. A video challenge can only be called by the head coach or a designated player. to entail: implicare footage: filmato spread: diffusione INSTRUMENTS FOR REFEREEING The integration of technology in various sports has changed the officiating practice, requiring referees to interact with and rely on specific technical devices. One of the most important and recent technological innovations, which is now very widely used, is video refereeing. The aim of video refereeing is to assist officials in making accurate decisions in important matches and controversial situations in order to improve the fairness and integrity of the game. The VAR Due to the spread and fame of football, the Video Assistant Referee (VAR) system is one of the most widely known. The VAR is an official who monitors the match, assisted by an AVAR (Assistant Video Assistant Referee), using video footage from multiple camera angles, slow-motion, and ultra-slow-motion feeds. The VAR can be used to intervene in specific situations that can determine winning or losing, especially when doubts about the official s decisions occur . A VAR check can be called by the VAR officials, who continuously monitor the game, or requested by an on-field referee unlimitedly . Video challenge The video challenge is the video refereeing system used in volleyball. Both teams and the first referee of a match can ask for a video challenge in controversial situations, for example when it is not clear if the ball is in or out, to determine if the ball touched a player s body before going out of bounds, to decide if the player serving touches the end line or comes into the court before hitting the ball, or to confirm if a team made more than three contacts with the ball before sending it over the net. Teams are usually given two challenges per set; if the original decision is confirmed, the team who called the challenge retains the same number of possibilities to ask for it. Other video refereeing systems Video refereeing and similar technological aids are used in various other sports, for example: in rugby, a system called Television Match Official (TMO) is used to review doubtful offside positions and fouls; in tennis, the Hawk-Eye system is used for line calls, double bounces, or net touches. It can be called by the umpire and it is managed by a video operator; in basketball, a replay centre, together with courtside monitors, allow referees to review plays. These video systems are mainly used, for example, to determine if a shot was released before the time expired or which player last touched the ball; in athletics, video recording helps decide on false starts, finish order, and to settle controversies about relay exchanges and lane violations. 122 PHYSICAL EDUCATION