This book is written for early childhood and primary educators who deal with challenging behaviors in young children. It describes the development of a system of program-wide and school-wide positive behavior supports (PW/SW-PBS), and provides the research base and identifies the critical components for successful implementation. Throughout the book the overarching theme is that social behavior needs to be taught and practiced in order to prevent and intervene with challenging behavior. The authors describe the key features of universal supports, as well as targeted small-group and intense individual interventions. The book includes many examples from preschool programs and elementary buildings.