People committed to a sociopolitical ideology have different skills they can offer to a social movement designed to bring about social change. In this paper, Janet Chafetz contends that feminist social and behavioral scientists can maximize their movement contributions by doing excellent social science on gender issues; that is their unique contribution. She offers her view of what that entails, namely, the development of gender theory including well-defined and empirically relevant concepts and the use of the most appropriate methodologies available to answer the specific questions raised by such theories.