The development of volleyball in recent years has greatly conditioned the service, one of the most important elements of the game, with significant technical and tactical changes. A methodology based on observations is proposed using models to quantify and assess the risk levels assumed by volleyball players at the moment of the serve, and developing a system category for it that includes the main response levels that affect this element of the game. This methodology has been tested with a sample from Spanish and Italian leagues, and the results obtained show the validity of the proposed formula.
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