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The purpose of this paper is to find out the effect of the use of the commit block on the number of players in the block and block effectiveness in the side-out phase and counter-attack phase, and give reference values on the utilization of the commit and reading block. The sample was made up of four male national teams (Portugal, Japan, Cuba and Yugoslavia). The actions of the teams where analyzed in 549 sequences corresponding to 25 sets of the World League 2001. The variables studied were: game phase, usage of the commit block against first tempo, block effectiveness, and spike opponent’s error. The results show that the use of the commit block difficult the formation of double and triple blocks in the wings and does not increase the block effectiveness or the opponent’s error in spike.