This volume provides a comprehensive clinical-developmental framework for understanding and treating behavior problems in early childhood. Susan B. Campbell offers a highly readable account of the developmental tasks and transitions that young children face in cognitive, social, and family domains, and examines why and what happens when development goes awry. Particular attention is given to the critical question of how certain children manage to successfully overcome difficult transitions, while others face the risk of serious, ongoing problems. Empirically supported prevention and treatment approaches are reviewed.