A study was conducted to validate the Army's Computerized Adaptive Screening Test (CAST), using data from 2,240 applicants from 60 army recruiting stations across the nation. CAST is a computer-assisted adaptive test used to predict performance on the Armed Forces Qualification Test (AFQT). AFQT scores are computed by adding four subtest scores of the Armed Services Vocational Aptitude Battery (ASVAB): word knowledge, arithmetic reasoning, paragraph comprehension, and half of the numerical operations subtest. The validity of CAST's paper-and-pencil counterpart, the Enlistment Screening Test (EST), was also examined in this study, using a smaller sample of 688 applicants. Analyses indicated that both CAST and EST were good predictors of AFQT performance; correlations with AFQT scores were .82 and .79, respectively. CAST scores accounted for 67 percent of AFQT validity and EST, 62 percent. Results also indicated that optimal efficiency was achieved with a CAST test length of 10 word knowledge items and 5 arithmetic reasoning items. Administration of the current CAST required 12 minutes. Small race and sex differences existed. Additional research was recommended in order to provide cutoff guidelines for recruiters in advising applicants on their predicted ASVAB success. (GDC)