The CATCH-ON Study began in 1998. It's purpose was to assess the degree to which CATCH intervention goals (reduction of fat and saturated fat in school meals, increase in physical activity, no tobacco use, and implementation of the CATCH curriculum) were maintained or institutionalized in the original 56 CATCH intervention schools and in 20 control schools. CATCH-ON was Phase IV that ended March 31, 2001. To determine the influence of secular trends, the outcome measures were also assessed in 12 newly recruited (unexposed) schools. Measures of school climate, teacher and staff characteristics, school turbulence and school facilities and resources were assessed to help explain the variation in the degree of institutionalization in the CATCH intervention and control schools.