A penalty shoot-out (officially kicks from the penalty mark) is a method of determining the winner of an association football (soccer) match that is drawn after the regulation as well as extra playing time. In a penalty shoot-out, each team takes turns attempting a specified number of shots (5 in FIFA-governed football) from the penalty mark that are only defended by the opposing team's goalkeeper, with the team scoring the most goals being declared the winner. Although the procedure for taking kicks from the penalty mark resembles that of a penalty kick, there are some differences. Most notably, neither the kicker nor any player other than the goalkeeper may play the ball again once it has been kicked. The method of breaking a draw in a match requiring a winner is determined beforehand by the match organizing body. FIFA-sanctioned competitions and most professional level competitions employ kicks from the penalty mark following one or more extra periods of play ("extra time"); the length and number of extra periods as well as whether or not they are sudden death are also stipulated by the match organizing body. Although employed in football commonly since the 1970s, penalty shoot-outs remain unpopular with some, due primarily to their perceived reliance on luck rather than skill.