The Council of Chief State School Officers (CCSSO), the Collaborative for Academic, Social, and Emotional Learning (CASEL), and the American Institutes for Research® (AIR®) developed this toolkit to support state and district leaders who are interested in engaging in the work of integrating equity-focused social-emotional learning (SEL) into a multi-tiered system of supports (MTSS). Incorporating lessons learned from leading states, practical guidance, and adaptable templates, this toolkit addresses five key questions:

1. What do we mean by SEL, MTSS, and equity?
2. Why integrate SEL into MTSS?
3. What does SEL integrated into MTSS look like?
4. How can state and district leaders get started?
5. Where do we go from here?