This research proposal supports a program in social psychology which uses a variety of game paradigms and related tasks to obtain estimates of the relative dominance of various social motives including those of maximizing own gain (individualism), joint gain (cooperation), and relative gain (competition). Numerous major studies completed or in progress provide background information on (1) the impact of various variables affecting choice behavior; (2) paradigms revealing motivational dynamics underlying choices; (3) validity of two types of models in describing the dominance of motives for choice; (4) development of motives between children in cross-cultural studies; (5) strategies of players in two-person bargaining situations and (6) the utility of statistical and other methods for analyzing social interaction. The proposed program would continue the final analysis of cross-cultural developmental studies; further develop an initial model of motivational bases of cooperative and competitive choice behavior; continue investigation of changes in strategy at various age levels and across various bargaining situations; and initiate a new program of studies on the effects of various social motives upon several learning and performance tasks among children at the second, fourth, and sixth grade levels. (WY)