"Reciprocity," a social simulation game based on exchange theory, was developed by the author to study the dynamics of power relationships in the context of marriage and the family. The simulation can be manipulated to test specific aspects of three major exchange formulations: Blau's social exchange formulation; Emerson's power-dependence formulation; and Berger's status-value formulation. First, these formulations are outlined and an integrated model presented. Second, the Reciprocity game model is described. Third, the operationalization of the theoretical model in the simulation game is specified. Last, the way in which Reciprocity may be used to study power in family relationships is illustrated in terms of a husband-wife and a parent-teen version of the simulation game. (Author)