The Advancement Via Individual Determination (AVID) program is designed for grades 6 through 12, prepares students most underrepresented in secondary education for four-year college, and restructures the teaching methodology of an entire school to make college preparatory curricula accessible to almost all students. To achieve this goal, school personnel at all levels receive comprehensive staff development to help them set high expectations and learn specific educational strategies to help students achieve. The staff training implements the emphases of the California Frameworks for student achievement. Low-level tracking is eliminated for students, who are given academic and motivational support. Statistics from AVID's 10-year history at Claremont High School in San Diego County (California) highlight many successes, including the enrollment in academic classes of about 150 students who would not otherwise be in those classes. AVID programs have been implemented in 45 high schools and 35 middle/junior high schools in San Diego County. The 1990-91 evaluation of the implementation of AVID in 45 high schools with over 3,000 students confirms the efficacy of the program for students of varying ethnic backgrounds, including Latino, African American, White, Asian and Pacific Islander, and American Indian. The teaching methodology is summarized; and results of an evaluation of an AVID summer institute, including participant comments, are presented. Statistical data are provided in three tables, and two figures help illustrate the program design. (SLD)