This paper specifies a conceptual model for training system development describing the interrelationship of MPT Resource Requirements Analysis, ISD training content development, and technical documentation for military tactical weapon systems and training devices. It describes how a common data base containing specific performance data drives a variety of analytic, resource determination, and requirements decision tasks. It discusses the interface points and impacts of the three military training system development components on each other and on their products. It demonstrates how military and contractor manpower and training analysts and hardware and software engineers can coordinate their data collection, analysis, and documentation efforts in a timely and cost-efficient manner.