Stated simply, a Multi-Tiered System of Supports (MTSS) is a school using data to provide every student with the support they need, when they need it. MTSS is a foundational paradigm, meaning that every practice, procedure, and policy in a school can be viewed meaningfully through the lens of MTSS. MTSS is at the core of SCRED's mission because when schools organize their supports within this framework, effectiveness increases and everyone benefits.