How is it that boys and girls, men and women end up with different interests, occupations, and traits? How can we distinguish real gender differences from beliefs about gender differences? How do gender-differentiated behaviors and stereotypes change from childhood to adulthood? This monograph reviews theories and methods that have been used to study gender differentiation in the past, and then offers a new suite of measures designed to assess children's and adults' gender-related attitudes towards others and gender-related characterizations of self. Two pathways for developmental change are presented, one in which children's gender attitudes are hypothesized to affect their later behaviors and the other in which children's own behaviors are hypothesized to influence their later attitudes. Closing chapters provide longitudinal data relevant to these developmental pathways and discuss implications for research and practice.Liben, Lynn S. is the author of 'Developmental Course of Gender Differentiation Conceptualizing, Measuring, and Evaluating Constructs and Pathways', published 0017 under ISBN 9781405110488 and ISBN 1405110481.