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The aim of this study was to examine the contribution of the systemic approach to the analysis of play in team sports. We first focus on the theory of dynamical systems and consider the interactions between the main variables of the different components of systems and subsystems in soccer. In team sports, these variables represent fluctuating conditions, which momentarily constrain the organization of action for the players. Thus changes in the momentary configuration of the game have to be examined in the light of previous configurations, the outline of the defensive strategy and the tactical choices involved. To study this problem, we analyse the antecedents of goals in soccer. A procedure is proposed which analyses transitions between configurations of play, thus allowing time to be taken into consideration when studying the evolution of a match. To illustrate the use and benefit of the analytic procedure, two goals are described in terms of dynamic configurations of play and opportunity of choices made by attackers.

The purpose of this paper is to discuss a procedure to assess individual performance in team sports in contexts of preassessment and formative assessment. An authentic assessment procedure based on the observation of players’ actions during matches yielded two performance indices: the efficiency index and the volume of play. A general nomogram is suggested for use with various team sports in order to produce a single performance score combining both indices. Content validity, concurrent validity (.74), and ecological validity are discussed. The interobserver reliability (>.90) of the data and the stability of performance (.88) are also examined. Some conditions are discussed for integrating the assessment procedure to the teaching-learning process with an active participation of the students in the collection and interpretation of the data. The proposed procedure is strictly game oriented and yields information reflecting both motor and tactical skills.

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