Positive Behavior Support (PBS) has emerged as a behavioral support that focuses on ecological relevance and meaningful outcome in the form of lifestyle change. PBS is a strategy that attempts to reduce or eliminate inappropriate behavior utilizing a multi-component behavior plan. The plan has two features: functional behavior assessment and a comprehensive behavior plan. At the school-wide level, primary prevention focuses on monitoring and preventing problem behaviors across entire student populations. At the next level, secondary prevention utilizes strategies aimed at preventing increased behavioral problems among students for whom primary prevention efforts have been insufficient in facilitating success. Finally, tertiary prevention is directed at preventing crisis and severe disruptive behaviors across larger life domains and is implemented with the students for whom both primary and secondary strategies have been unsuccessful. This article focuses on severe disruptive behavior (SDB) and the management of SDB by the application of positive behavior support strategies. It seeks to (a) provide a rationale for the use of PBS, (b) define PBS, (c) provide research support, and (d) discuss different PBS strategies for managing disruptive behavior. (Contains 5 figures.)