The study aims to identify the effectiveness of offensive tactical activity according to the numerical change cases and its productivity during the game's periods in light of the law modifications regarding the involvement of the goalkeeper's substitute. The research sample included 76 games of the 2017 World Men's Championship in France, the twenty-second edition, using a form prepared by the researchers in order to observe the visual scoring of the matches of the research sample and the results showed that there is a difference between the effectiveness of the offensive tactical activity in the participating teams, according to the numerical change cases in addition to the variation of the offensive tactical activity productivity during the match between the participating teams. The most notable recommendations were: increasing the training to master the formations and offensive patterns that occur in the different situations in the game, the development of individual and group offensive performance, depending on the action instead of the reaction to attract the defender's attention outside the formation finishing zone in addition to training the players to take advantage of the numerical changes by designing compulsory training and technical positions during training and the friendly matches to implement them.