This study was part of a longitudinal research project to establish the validity of the Ball Aptitude Battery (BAB) relative to various academic criteria. The BAB is a multiple ability test battery of specific work skills for use in career counseling. Previous research has demonstrated that adequate validity coefficients exist for both job performance criteria and training criteria. Using data from 976 high school seniors, the purposes of the present study were: (1) to assess if level differences in performance exist on the BAB and on the ten academic criteria across sex, race, and socioeconomic status; (2) to determine the concurrent validity of the BAB against academic performance in ten high school subject areas; (3) to examine the differential validity of the BAB relative to various sex and ethnic groups; and (4) to investigate the construct validity of the BAB by comparing it to similarly available tests--the Differential Aptitude Test (DAT) and the American College Test (ACT). Two additional but minor objectives of the study were: (1) to derive an empirical data-based socioeconomic status; and (2) to determine the best linear combination of BAB tests to predict success in four major academic areas (English, math, social studies, and natural science). (BS)