This technology was developed for organizations responsible for the maintenance of many dispersed systems or facilities on a continuous (7 x 24) basis. Examples include the Federal Aviation Administration, telecommunications companies, utilities, and the military. In such cases, a tradeoff must be made on the cost of keeping the services up and the costs of the staffing, training, geographic deployment, and logistics required to provide service on a continuous basis. We have developed both top-level high speed analytical methods and detailed simulation models to enable the prediction of downtime and system availability as a function of staffing, training, shifts, equipment failure rates, presence of redundancy, spares deployment, and related factors.