Scaling up evidence-based educational interventions to improve student outcomes presents challenges, particularly in adapting to new contexts while maintaining fidelity. Structured teacher adaptations that integrate the strengths of experimental science (high fidelity) and improvement science (high adaptation) offer a viable solution to bridge the research-practice divide. This preregistered randomized controlled trial study examines the effectiveness of structured teacher adaptations in a Tier 1 content literacy intervention delivered through asynchronous and synchronous methods during COVID-19 on Grade 3 students’ (N = 1,914) engagement in digital app and print-based reading activities, student-teacher interactions, and learning outcomes. Our structured teacher adaptations achieved higher average outcomes and minimal treatment heterogeneity across schools, thereby enhancing the effectiveness of the intervention rather than undermining it.
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