A research project was developed to construct and demonstrate a methodology for estimating the costs of conducting on-the-job training (OJT) in the Air Force. The project focused on the formal upgrade training to the three, five, and seven skill levels. Project efforts involved five major tasks: literature review, cost factor identification, cost factor quantification, specification of costing methodology, and demonstration costings. A series of cost estimating relationships were produced that will employ existing Air Force data systems to generate the desired OJT program costs at various command levels and over a range of user specified time intervals. The methodology, based on factor estimation, provides reasonable cost estimates for budgeting and planning purposes, without burdening the user with costly and time-consuming data collection requirements. (CSS)