State agencies provide for MTSS [multi-tiered systems of support] initiatives with the purpose of producing meaningful outcomes. The impact of MTSS is dependent upon the ability of educators to implement the practices correctly and consistently. A lack of implementation fidelity can result in a practice or program being less effective, less efficient, or producing less-predictable responses (Sanetti Collier-Meek, Long, Kim, & Kratochwill, 2014; Wang et al., 2015). A focus on supporting fidelity of implementation increases the likelihood of student success. This document brief highlights four key actions SEA [State Education Agency] teams can take to help support implementation of MTSS with fidelity.