The heart of any RTI model lies in the use of tiered instruction. In the RTI framework, the instruction delivered to students varies on several dimensions that are related to the nature and severity of a student's difficulties. Edward Shapiro of Lehigh University provides a detailed explanation of the multi-tiered instructional component of RTI. Read "Tiered Instruction and Intervention in a Response-to-Intervention Model."
All students in Tier 1 receive high-quality, scientifically based instruction, differentiated to meet their needs, and are screened on a periodic basis to identify struggling learners who need additional support.
In Tier 2, students not making adequate progress in the core curriculum are provided with increasingly intensive instruction matched to their needs on the basis of levels of performance and rates of progress.
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