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The California Department of Education’s (CDE) definition of Multi-Tiered System of Support (MTSS) provides a basis for understanding how California educators can work together to ensure equitable access and opportunity for all students to achieve the Common Core State Standards (CCSS). MTSS includes Response to Instruction and Intervention (RtI²) as well as additional, distinct philosophies and concepts.

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"MTSS focuses on all students in education contexts."

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"Integrating a data collection and assessment system, including universal screening, diagnostics and progress monitoring, to inform decisions appropriate for each tier of service delivery."

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Supporting high-quality standards and research-based, culturally and linguistically relevant instruction with the belief that every student can learn including students of poverty, students with disabilities, English learners, and students from all ethnicities evident in the school and district cultures.