The major function of the PBiS approach is to deal with students' behavior in the most effective way to help with each student's overall success.
To elaborate, the program offers a primary, secondary, and tertiary level of intervention. A basic tenet of the PBiS approach includes identifying students in one of three categories based on risk for behavior problems. Once identified, students receive services in one of three categories: primary, secondary, or tertiary. To help practitioners with differences in interventions used at each of the levels the professional literature refers to a three-tiered (levels) model. Interventions are specifically developed for each of these levels with the goal of reducing the risk for academic or social failure. These interventions may be behavioral and/or academic interventions incorporating scientifically proven forms of instruction. The interventions become more focused and complex as one examines the strategies used at each level.