This article describes and evaluates the Gender Attitude and Belief Inventory (GABI), a teaching tool designed to aid students in (a) realizing how sociological theory links to their personal beliefs and (b) exploring any combination of 11 frequently used theoretical perspectives on gender, including both conservative theories (physiological, sociobiological, and structural functionalist) and feminist ones (liberal, socialist, Marxist, radical, separatist, cultural, multicultural/black, and postmodern feminism). In this article, I discuss the inventory, how I use it in my sociology of gender class, and how it could be adapted for use in other classes. I also analyze qualitative and quantitative evaluations of its effectiveness based on responses from students at two universities ("N" = 603) and pretest and posttest results of its impact on student learning immediately following the activity ("N" = 161) and at the end of the semester ("N" = 33). These data suggest that the GABI increases students' understanding of theoretical perspectives on gender, encourages them to reflect on their own views and (mis)perceptions of theories, and is an engaging exercise for students. Most importantly, this is a valuable exercise to aid students in realizing how sociological theory links to their everyday lives. (Contains 3 tables.)