National Center on Response to Intervention Definition of RTI

Response to intervention (RTI) integrates assessment and intervention within a multi-
level prevention system to maximize student achievement and to reduce behavior  problems. With RTI, schools identify students at risk for poor learning outcomes,
monitor student progress, provide evidence-based interventions and adjust the
intensity and nature of those interventions depending on a student’s
responsiveness, and identify students with learning disabilities.

For a listing of resources that will help parents navigate assessment and intervention click:  RTI Parent Resources