In the last decade, mental health professionals have been under mounting pressure to demonstrate the cost effectiveness of their treatment choices and practices. Progress has been made, related in part to improvements and refinements in diagnostic classifications that are increasingly empirically determined and behaviorally based. Historically, however, research on the treatment of children and adolescents has lagged behind research on the treatment of adults. The growing realization that early intervention can prevent serious psychological dysfunction in adulthood has stimulated much more...