An account is presented of the development of a job performance test for the Learner Centered Instruction (LCI) weapon control systems mechanic/technician Air Force course. The performance test was administered to the LCI experimental course subjects as well as the control course subjects upon graduation. Test items are, for the most part, based on tasks derived from the behavioral description of the actual job. The test contains three major parts: operational checkout, troubleshooting, and auxiliary task performance. Most of the test items are performed on the Simulated Maintenance Task Environment, a simulator used for F-111A flight line electronics maintenance testing and training. (author/ly)