Multiuse Simulations are even more critical in light of current budget constraints. Early planning during F-22 development has provided a unique opportunity to maximize simulation synergism across an entire Weapon System. Via Integrated Product Teams (IPTs), the Air Vehicle, the Support System, and the Training System are being developed concurrently. Potential simulations for REUSE by the Training System were identified early to be able to incorporate training requirements into Air Vehicle and Engineering lab developments.

This paper describes "Lessons Learned" in developing simulations to satisfy multiple engineering laboratory and training requirements and also provides examples of specific cases where Training System personnel have acted as "integrators" between various Air Vehicle IPTs.

A good example is the development of the Flight Dynamics Simulation (FDS). FDS has completed Preliminary Design Review (PDR), Critical Design Review (CDR), coding, integration and testing, and will be operational in the Vehicle Management System (VMS) Integration Facility (a full-up pilot-in-the-loop engineering flight simulator) by the time this paper is presented. All potential users, including training system personnel, were involved in requirements, review, and approval cycles. All identified training requirements have been met. Examples are given of how FDS development "Lessons Learned" have been shared with other REUSE engineering simulation developers.

Challenges that lie ahead and the processes being put in place include (1) how to develop a robust, flexible design based on early requirements that we know will change, i.e., how to incorporate REUSE simulations into the final media that result from Instructional System Development (ISD) and provide these REUSE simulations to the ultimate training simulator designer and integrator and (2) how to update the REUSE simulations during the Weapon System life-cycle while satisfying the requirements of diverse users.