The PBIS framework organizes supports within tiers. The primary prevention (Tier 1) applies to all staff, students, and settings and ensures all students have access to culturally and contextually relevant evidence-based academic and social supports. For groups of students who need additional supports in one or more areas, the secondary prevention (Tier 2) provides intensified instruction and support in addition to Tier 1 supports. Finally, for students who need additional support, the tertiary prevention (Tier 3) provides individualized and intensive supports.