Within multi-tiered systems of support (MTSS), including Positive Behavioral Intervention and Supports (PBIS) and Response to Intervention (RTI) models, Tier III represents the most intense level of intervention. Interventions at Tier III are highly individualized, with a specific student in mind, and carefully consider the context of behavior, including function, for intervention planning. Given the intense and individualized nature of Tier III interventions, it follows that these efforts are reserved for students with the most significant needs. It estimated that 1%–5% of students require Tier III intervention for behavior. This chapter describes the distinguishing features of Tier III, discusses issues related to the transition from Tier II to Tier III, overviews appropriate assessment and progress-monitoring methods, outlines effective intervention approaches, and provides general guidelines for implementation of Tier III services.
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