Although there is a substantial empirical foundation for the basic intervention components of behavior analysis and positive behavior support (PBS), the field still lacks a standardized program model of individualized PBS suitable for widespread application by school personnel. This article provides a description of a standardized PBS model that is in the process of development and large-scale evaluation. The "Prevent-Teach-Reinforce" (PTR) model is designed to meet the behavior support needs of students with serious behavior challenges in a broad range of school settings. Included in this article are an overview of the model's components and implementation process, two case examples, and a discussion of the model's status and future directions. (Contains 2 tables and 2 figures.)