and increase or decrease opportunities for exercise during the school day or as communities implement or eliminate walking and bicycle paths. Such social and policy decisions are rich opportunities for learning about behavior change and health.

Recommendation 7: Program planners and policy makers need to consider modifying social and societal conditions to enable healthy behavior and social relationships. Interventions must be evaluated to enable continuous improvement of programs and policies. Research in these domains should be rigorous and scientific, but method should not dominate substance. Longitudinal research designs, natural experiments, quasi-experimental methods, community-based participatory research, and development of new research methods are necessary to advance knowledge in these areas.

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