Instruction, enrichment, and intervention are delivered along a continuum to meet the full spectrum of social, emotional, behavioral, and academic needs of all students. In a multi-tiered system of supports, tiers describe the intensity of support provided. Tiers do not define students. Every student has equitable access to universal instruction and supports that are culturally and linguistically responsive, universally designed, and differentiated to meet their unique needs. More info from OSPI