Educational Policy Improvement Center (EPIC) researchers visited 38 public high schools around the United States in 2007 and 2008 with the goal of validating and operationalizing a definition of college readiness. Schools in the sample were selected because they were demonstrating success at enabling more students from underrepresented groups to be ready for postsecondary education. This paper presents a qualitative summary of what researchers collected--programs, activities, practices, attitudes, and cultures of the schools visited. The results of the study include the identification of seven key principles underlying a comprehensive approach for promoting college readiness. In addition, the findings have resulted in the creation of an instrument, the CollegeCareerReady School Diagnostic, to measure school level college readiness over time and provide a detailed profile tied to actionable recommendations and resources. (Contains 3 footnotes, 3 tables, and 3 figures.)