This report presents information on similarities and differences between U.S. high school sophomores as studied at three points in time over the past 22 years, with a focus on cohort demographics, academic programs and performance, extracurricular activities, life values, and educational/occupational aspirations. It provides an update to the National Center for Education Statistics (NCES) report published in 1993, "America's High School Sophomores: A Ten Year Comparison" (Rasinski et al. 1993). This report uses data from the following NCES studies: (1) sophomores in 1980, as studied in High School and Beyond (HS&B); (2) sophomores in 1990, as studied in the National Education Longitudinal Study of 1988 (NELS:88); and (3) sophomores in 2002, as studied in the Educational Longitudinal Study of 2002 (ELS:2002). The report is descriptive, serving to update published information on the HS&B and NELS:88 sophomore surveys with additional information from ELS:2002 for selected comparable questionnaire items. Secondary purposes are to note qualifications and limitations to the survey-based data comparisons and also to note related additional information from other data sources, such as the Current Population Survey (CPS), over the same period. With a few additions, the topics selected for the report are based on those selected for inclusion in the previous report comparing the 1980 and 1990 sophomores (Rasinski et al. 1993). The primary focus of this report is observation of change over the period for national averages and for subgroupings that have been of traditional interest to the NCES longitudinal studies. Appended are: (1) Technical Notes and Glossary; and (2) Standard Error Tables. (Contains 77 tables and 22 figures.) [This report was also produced by Kforce Government Solutions.]