Twenty-five schools from five cities across the U.S. were recruited to participate in a rigorous random assignment evaluation of the Playworks program, which places full-time coaches in low-income schools to provide opportunities for organized play during recess and throughout the school day. To address the study’s primary research questions, we obtained data from both treatment and control schools near the end of the school year, in spring 2011. Data collection activities included administration of student and teacher surveys, recess observations, collection of student physical activity data, and collection of administrative records from schools. Our data collection activities focused on six outcome domains: (1) school climate, (2) conflict resolution and aggression, (3) learning and academic performance, (4) recess experience, (5) youth development and (6) student behavior. This paper will describe the study design, findings, and lessons learned from our data collection and school recruiting activities.#Prek-12EducationalEvaluation #2012Conference