The study established that perceptions of nondiscrimination and harassment policies and inclusive programs were correlated with each other, that perceived policies and programs were both predictive of the perceived prevalence and tolerance of anti lesbian, gay, and bisexual (LGB) harassment in the social domain, and that perceived programs and harassment were in turn predictive of personal victimization experiences. This study builds on previous work in which an ecological framework for operationalizing heterosexism in high schools was developed. The goal of the study was to examine setting-level predictors of anti-LGBQ harassment and victimization experiences. The study was based on secondary analyses of Internet survey data that were collected between August and October of 2000 from LGBQ high school students across the United States and Canada. Tables and references