Today's weapon systems are extremely sophisticated and as more advanced technology is incorporated into their design, they will be even more complicated. A significant amount of effort is expended into determining mission need requirements and designing a notional architecture for a new weapon system. However, associated training requirements are often oversimplified. Training related RFPs, proposals, and front end analyses (FEA) are often undertaken without a true understanding of methodologies used to determine actual training requirements. This paper describes a process that uses information from the Department of Defense Architectural Framework (DODAF), the Tactical Scenarios (TACSITs) derived from the Weapons System's Concept of Operations (CONOP) and the Mission Essential Task List (METL) to determine initial requirements that serve as a foundation for developing a total training system.