Educator professional development in the 4-H Youth Development Program needs improvement. Lesson study, an iterative and educator-centered approach to professional development, has proven to be effective in school-based settings; however, research on the model in youth development programs is limited. The present study investigated the use of lesson study with professional Cooperative Extension staff, adult 4-H volunteers, and teenage 4-H volunteers in different 4-H contexts in three state

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... ams. Findings revealed improvements in educators' data-driven decision-making, content knowledge, lesson planning and implementation, and social connections across all contexts. To work effectively within the 4-H context, however, some adaptations to the model were necessary.