Response to Intervention (RTI) is a multi-tier approach to the early identification and support of students with learning and behavior needs.The RTI process begins with high-quality instruction and universal screening of all children in the general education classroom.hough there is no single, thoroughly researched and widely practiced “model” of the RTI process, it is generally defined as a three-tier (or three-step) model of school supports that uses research-based academic and/or behavioral interventions. The Three-Tier Model is described below.