This report is the second of two technical reports produced as part of the Study of Excellence in High School Education. These studies are: (1) a cross-sectional analysis comparing 1972 high school seniors and their schools with 1980 high school seniors and their schools; and (2) a longitudinal analysis relating growth and development of 1980 high school sophomores to their schooling experience over the period 1980-82. The basic issues concern the identification of school and student factors that affect student outcomes. The major issues addressed are: (1) How did American high school students change between the sophomore and senior years in terms of cognitive achievement, educational and occupational aspirations, school related behaviors, and attitudes and values? (2) What factors accounted for changes in high school student outcomes (demographic, student variables, school variables and educational support systems)? (3) How did changes in the cognitive achievement and attitudes of high school dropouts differ from those of teenagers who chose to stay in high school? Appendices include: definition classification variables, description of ethnic group definitions, cross tabulation for the sample and student background, list of courses in the transcript file, and the detailed cross tabulation for changes in students' behavior, plans, and attitudes. (JAZ)