This multidisciplinary proposal is synchronous with specific research objectives articulated in Program Announcement (PA-10-052) School Nutrition and Physical Activity Policies, Obesogenic Behaviors and Weight Outcomes. As noted, few studies to date have examined the policy implementation process. We directly target the implementation and impact of health-related policies in schools, measuring obesogenic behaviors and BMI as primary outcomes. We have an active tracking system to monitor impact of policies, and we focus on minority populations traditionally vulnerable and underserved. As stated by NIH in this program announcement, policy-based approaches to combat obesity in schools exist; however, knowledge is lacking in key areas concerning the optimal policies, key implementation strategies for such policies, and the impact of these policies on important health and social outcomes. The proposed project will advance scientific knowledge and understanding in this arena and provide important evidence to guide future interventions in schools and communities translating science to improved health of the public.