In this volume, Virginia Brabender and April Fallon chronicle the rich history of group development research, provide a survey of modern theories of group development, and introduce the authors' own five-stage model of group development. The authors demonstrate the importance of group identity to the achievement of treatment goals through a series of vivid, real-life vignettes that illustrate the characteristic behavior of group members at each stage. They apply their developmental perspective not only to traditional unstructured groups but also to focused groups and groups emerging from postmodern frameworks, such as social constructionism and narrative psychology.