Multi-tiered System of Support [MTSS] also often referred to by the acronym RTI, Response to Intervention is a systematic approach to assisting students experiencing difficulty with learning and/or behavior. RTI is usually organized into three tiers of support. Tier 1 is provided in the regular education classroom as the school's general curriculum. Tier 2 is provided in small group settings usually in the regular education classroom with targeted instructional interventions in needed skills. Tier 3 is provided in small groups in a variety of settings and involves more structured and intense intervention. Because RTI is usually provided in this tiered format, it is referred to in law as Multi-Tiered Systems of Support (MTSS). Southwest ISD is committed to providing evidence-based instruction and intervention to all students in need of intervention through a three tiered system. Each campus has an MTSS (RTI) team which considers the needs of its students.