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American children need access to high-quality early education. One limiting factor is the lack of professional development for the childcare workforce. This study examined the impact of a professional development model designed for teachers working with preschool children in childcare settings. Intervention included an evidence-based early learning curriculum focused on social-emotional learning and early literacy. Center directors were trained to serve as program coaches. Childcare centers with classrooms serving preschool children were recruited from ten counties in [state blinded for review] characterized by concentrated population-level poverty and randomized to intervention and control groups. Teachers and directors showed high levels of intervention engagement and good program implementation. Pre- to post-test comparisons of the intervention and control groups revealed that the intervention …