This thesis describes the formative evaluation of the Tactical Patrol Craft Trainer (TPCT) during the implementation stage. The TPCT is an interactive multi-media computer based trainer designed to deliver a full fidelity and analog video training scenario to Prospective Commanding Officers (PCOs) of the Coastal Patrol Craft (PC) class ship. The system is designed to induce stress while enhancing autonomous decision making skills. The methodology involved six survey instruments, observation, and interviews with the trainees. The data show that the TPCT induces stress as intended, the user interface is appropriate, and the trainees perceived the training as valuable. Several improvements are noted in the course structure, user interface, and system application. Recommendations are made for more scenarios, additional applications of the technology, and evaluation of training effectiveness after the final implementation of the system.