Even though there have been substantial changes over the past few decades in the sorts of occupations and activities that are performed by and considered appropriate for men and women in our society, children continue to hold stereotypical attitudes and preferences. Although attitudes typically become more flexible with age (Powlishta, Sen, Serbin, Poulin-Dubois, & Eichstedt, 2001), adults are prone to gender stereotyping as well. In fact, under some circumstances, adults' perceptions of others are more stereotypical than are children's (Powlishta, 2000). As Liben and Bigler point out in their intriguing and important Monograph, "popular American culture is filled with evidence that gender is a common and pervasive dimension on which human experience differs."Despite this pervasiveness, and despite the fact that "psychologists have made the study of gender differences a major focus of the discipline," there remain gaps in our understanding of how and why gender differentiation develops. In particular, little is known about how children's development of gender-based attitudes concerning others is related to their own sex-typed development, particularly in later childhood-a limitation that Liben and Bigler attribute in large part to a lack of reliable and comparable measures of the relevant constructs. One of the major contributions of their Monograph is the introduction of new measures designed to assess both children's and adults' attitudes about others and conceptions of themselves across multiple domains of sex typing, including occupations, activities, and traits. The second major contribution comes from highlighting the fact that there are two potential ways in which gendered attitudes about others and sex typing of the self may be related: Either attitudes about others guide the individual's own selection of behaviors, consistent with most traditional cognitively oriented theories of gender-role development (and reflected in the proposed attitudinal pathway 167