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Computer systems support many coaching activities performed before and after competitions, such as strategy development and performance evaluation, but competent assistance during games is much more demanding. It requires real-time interpretation of sensor data, the recognition and classification of ball actions, and fast-action game analysis and assessment. Only recently has high-precision microwave technology enabled computer systems to simultaneously track the position of players and the ball. Consequently, real-time game analysis systems must be able to automatically recognize intentional activities in a multiagent system with continually acting agents. To meet these demands, we've developed the football interaction and process model and a software system that can acquire, interpret, and analyze this model. Our FIPM system can acquire models of player skills, infer action-selection criteria, and determine player and team strengths and weaknesses.