Browse the glossary below to learn the terms you need to know to successfully implement RTI in your school. This glossary was compiled using the following resources: The RTI Glossary of Terms developed by the IDEA Partnership @ NASDSE, the New Mexico Public Education Department RTI Glossary, and contributions from members of the RTI Action Network Advisory Council.

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Change made to instruction and/or assessment that does not change the expectations for performance or change the construct that is being measured. Accommodations provide access to buildings, curriculum, and assessments.


An adjustment to the instructional content or performance expectations of students with disabilities from what is expected or taught to students in general education. Adaptations can include decreasing the number of exercises the student is expected to complete, assigning different reading materials, or allowing use of a calculator.


Line on a graph that represents expected student growth over time. See Goal-line.


Measurement of student growth; assessment tool choice is dependent on the purpose and use of measurement results.

Authentic Assessment

Tasks that require students to apply knowledge and skills; often such tasks are connected to real-world situations/challenges; the tool usually used to assess progress is a rubric with well-articulated descriptions of quality performance/product.

AYP - Adequate Yearly Progress

A statewide accountability system mandated by the No Child Left Behind Act of 2001 which requires each state to ensure that all schools and districts make Adequate Yearly Progress as defined by states and approved by the U.S. Department of Education.