A work sample criterion test was developed for General Vehicle Repairman, MOS 63C30 and 63C40. Test items covered three task categories: troubleshooting, corrective action, and preventive maintenance. Thirty-eight organizational mechanics were tested at Fort Knox, Kentucky. Data were also collected on the quality of performance, for example, use of good procedures, use of test equipment, and so forth. The study indicated that (a) the test appears to have a high degree of reliability (r=.82), (b) on the average, 60% of the test exercises were successfully completed by the 38 mechanics, (c) there was a moderate relationship between performance and length of experience, and (d) there were indications of lack of use and unfamiliarity with technical publications, and also a lack of skill in the use of special tools and equipment. (Author)