This paper presents a model workshop focused on sex-typed behavior and developmental psychology, which is designed to examine the major theories based on biology, socialization or a complex developmental process. The materials concentrate on the three main theoretical approaches underlying the development of sex-role behaviors, i.e., psychoanalytical theory, behavioral/social learning theory, and cognitive-developmental theories. The "fit" of these theories into feminist perspectives and the goal of promoting an equal and equitable society are discussed. Elements of developmental models are described and a feminist developmental theory is proposed. Topics for group discussion are suggested to design interventions based on developmental theory as to why males and females have certain behaviors and attitudes. (JAC)