While several recent popular books address the topic of girls' meanness to one another, this volume offers the first balanced, scholarly analysis of scientific knowledge in this area. Integrating current research on emotion regulation, gender, and peer relations, the book examines how girls are socialized to experience and express anger and aggression from infancy through adolescence. Considered are the developmental functions of such behaviors as gossip, friendship manipulation, and social exclusion; consequences for both victims and perpetrators; and approaches to intervention and prevention. Presenting innovative research models and methods, this is an accessible and much-needed synthesis for researchers, professionals, and students. About the Author: Marion K. Underwood, PhD, is Associate Professor of Psychology in the School of Human Development at the University of Texas at Dallas. Her work has been published in numerous scientific journals, and her research program has been supported by the National Institute of Mental Health since 1995. She received the 2001 Chancellor's Council Outstanding Teacher of the Year Award.