Volume I of Theory and Research in Behavioral Pediatrics focused on issues of early human development, with special emphasis given to assessment of the preterm infant and to factors inftuencing the organization of the caregiver­ infant relationship. Chapters in Volume 2 cover a broader range of topics and encompass a wider age span. Chapter I provides a historical review of the relationship between developmental psychology and pediatrics. The authors, Barbara R. Tinsley and Ross D. Parke, discuss differences between behavioral pediatrics and pediatric psychology and note that interdisciplinary collaboration in research and application has increased steadily in re cent years. However, if similar collaborative efforts are to occur in education and training of pediatricians and developmental psychologists, it will be necessary to determine just what each discipline hopes to gain from such collaborative efforts. Tinsley and Parke report the results of anational survey designed to determine the areas of developmental psychology that pediatricians perceive to be of potential benefit to them in their delivery of pediatric care. Results of the survey suggest that there are many ways in which developmental psychology could be in corpora ted into the pediatric curriculum. In many respects, Chapter 2 sets the stage for the remaining chapters. Nancy A. Carlson and Thomas Z.