Evidence-based core instruction partnered with evidence-based supplemental interventions are vital for students' literacy learning, particularly for students who need additional support (Petscher et al., 2020). Identifying instructional materials that reflect the translation of effective practices is challenging, (Solari et al., 2020) and made…

This article draws on previously employed methods for conducting fidelity studies and applies them to an evaluation of an unprescribed intervention. We document the process of assessing the fidelity of implementation of the Math Recovery first-grade tutoring program, an unprescribed, diagnostic intervention. We describe how we drew on recent…