This book describes strategies for classroom teachers to use in interrupting or managing the cycle of acting-out behavior for students with serious behavior problems. The book has four sections. The first emphasizes the importance of using a proactive approach within a multi-tiered system of prevention. The second describes a seven-phase model that explains the successive interactions of an escalating behavior chain. Section three describes strategies for addressing each phase of the acting-out cycle. The intent of the strategies is to interrupt the cycle at that phase and prevent the escalation of acting-out behavior. The fourth section provides a summary and a case study of how to develop a behavior intervention plan to address all the stages of the acting-out cycle. The appendices provide checklists and forms to use in data analysis and intervention planning.