RTI is a multi-tiered data-driven process for providing interventions of increasing intensity to improve student outcomes. It involves universal screening, empirically validated interventions matched to student needs, frequent progress monitoring, and using student data to inform educational decision making. The goals and intensity of interventions vary across tiers, with three tiers most commonly used. RTI principles establish systems to deliver interventions through multiple tiers and use data to evaluate individuals, classrooms, and schools.