The next section of the book is devoted to discussion of developmental models of complex psychopathology. Patterson provides a rich discussion of implications of developmental theory for understanding early-onset delinquency. An interesting feature of his discussion is the focus on both stability and change of such behaviors and the importance of focusing on contextual variables. Cornblatt, Dworkin, Wolf, and Erlenmeyer-Kimling discuss the role of markers and developmental processes in schizophrenia. Their chapter focuses on impairments in attention as a marker for the schizophrenia genotype and in the development of symptoms, particularly those related to deficits in social skills. Brooks-Gunn and Attie review developmental psychopathology in the context of adolescence. They focus on eating and depressive disorders in the context of physiological, psychological, and social factors. They emphasize the importance of understanding the meaning, experience, and continuity of symptoms over time. Sigman summarizes recent behavioral research in autism, which has increased dramatically in the past few decades. A major focus of research has been the attempt to understand the nature of social dysfunction in autism.