The purpose of this study is to assess the reliability and validity of a brief, low-cost school environment audit tool, which is currently administered to all Pennsylvania Keystone Healthy Zone public schools. In addition, this research will also determine whether school policies and environments predict relative weight outcomes. The first phase of this work will consist of psychometric analyses (test-retest reliability, internal consistency, validity) of the audit tool, and the second phase will consist of multi-level (schools nested within districts) cross-sectional and longitudinal analyses of the relationship between health indicators and relative weight status.