Which of the following is NOT one of the three tiers of RTI?

The concept of Response to Intervention (RTI) is structured around three tiers that provide a framework for identifying students who require additional support and the intensity of that support. The tiers consist of:

1. Tier 1: This level includes research-based core classroom instruction designed to meet the needs of all students. It encompasses quality teaching strategies that benefit the majority of learners and is the foundation of the RTI framework.

2. Tier 2: This tier provides targeted instruction, which involves small group interventions for students who need additional support beyond that provided in Tier 1. It focuses on specific skill areas where students struggle.

3. Tier 3: At this level, intensive instruction is implemented for students who have not responded adequately to Tiers 1 and 2. This tier includes individualized instruction and may involve special education services for those who need it.

The choice that is not one of the three tiers is comprehensive assessment. While assessment is crucial in the RTI process to determine students' needs and the effectiveness of interventions, it does not constitute a tier of instruction. Instead, it acts as an ongoing process to monitor progress, adjust instruction, and make decisions about movement between tiers. Comprehensive assessment is a supporting procedure rather than