This report addresses the initial phase of a multiphase effort to install Training Assistance Technology (TAT) capabilities on a submarine combat system trainer (SCST), and evaluate their effectiveness during a formal training course. This phase addresses the (1) selection of the trainer and course with which to conduct the evaluation, (2) formulation of the TAT training process segment, (3) development of training exercises, (4) development of performance measures, (5) identification of TAT model and display characteristics, (6) recommendation of the TAT/SCST interface methodology, and (7) development of a long-term research and development plan. A laboratory experimental evaluation of several TAT capabilities using the MK 81 Weapon Control Console (WCC) simulation with active submarine officers as subjects is also described. Appendices include a description of training courses and training device characteristics, interface discussion, summary of model training contents, training strategy summary, training exercises and displays, experimental and control group exercise guides, TAT experimental evaluation scenarios, and trainee input characteristics. (Author/CMV)