Presented are abstracts of 14 research reports. Topics covered include: (1) the effects of games on mathematics skills and concepts; (2) the use of problem-solving heuristics in the playing of games involving mathematics; (3) sex differences in electing mathematics; (4) the origins of sex differences in high school mathematics achievement and participation; (5) the long-term consequences of sex differences in high school mathematics achievement; (6) locus of control and mathematics instruction; (7) the interaction of general reasoning ability and Gestalt and analytic strategies of processing spatial tasks with transformational and non-transformational treatments in secondary school geometry; (8) student performances, individual differences, and modes of representation; (9) the development of problem-solving capabilities in primary grade children; (10) story problems; (11) spatial visualization skill and processes used in solving mathematical problems; (12) factors of organization and clarity in mathematics lessons; (13) the psychology of equation solving, an information processing study; and (14) number concepts and the introduction of calculus. (MK)