MTSS
A Multi-Tiered System of Support (MTSS) is a system specifically designed to intervene when students are identified as having a specific learning or behavioral need (or set of needs), support them with specific and targeted interventions, monitor their progress, and ensure that they succeed. Success can be measured in terms of making sure students reach grade-level targets, making sure students that need acceleration beyond grade-level targets are challenged at an appropriate level, or by identifying and teaching students needed social/emotional strategies to enable them to have optimal behavioral health and healthy relationships.
MTSS is really a continuum in levels of evidence-based practices meant to support students at many levels, from the classroom level to one-on-one interventions if necessary.