TMC Services' broad capabilities in systems engineering extend from pre-conceptual phase mission analysis through development of models to support operational logistics. TMC Services develops functional analyses, allocates systems to functions, develops the design and performance requirements that constrain both the facility and individual systems, and defines system interfaces. This approach ensures top to bottom traceability and supports technical baseline control. TMC Services performs system trade studies enable identification and selection of the best design and operational alternatives for complex interfacing systems. TMC Services' innovative integrated systems performance tools that use inductive event tree-based and multi-attribute techniques have proven to yield useful and cost-saving insights when detailed system interaction is not yet established. To determine expected operational performance, operating costs, required spares, and spare logistics, TMC Services has the capability to develop large, multi-level reliability and availability simulation models.