The present study was undertaken, at request of the Signal School, Fort Monmouth, to improve sel ection of enlisted students in the Automatic Data Processing Fieldata Programming course.tthree Army Classification Battery composites- thecurrent 1962 Clerical Aptitude Area, the previous operational composite, and the General Technical Aptitude Area, a logical alternate were evaluated for effecevveness as selectors for the course. The IBM Programmers Aptitude Test, an instrument used at the Signal Sooool for selecting programmer trainees, was also included in the analysis. Calidity was assessed against final course grades. While the Pro grammers test had the most substantial validity r equals .67 of any single measure in the study, the General Technical GT Aptitude Area proved the most effective test combination r equals .61 for selection to the ADPS Pro gramming course. Results supported a change in the aptitude area of selection t the ADPS course from CL to GT with a cutting score of 110.