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An Introduction to the Joint Modeling and Simulation System (JMASS) Vernon K. Handley Peter M. SheaDynetics, Inc. P.O. Box 5500 Huntsville, AL 38814-5500 205-964-4311, 205-964-4296 vernon.handley@, pete.shea@ CPT Mark Morano Joint Modeling and Simulation System (JMASS) Program Office ASC/SMJ Building 28 2145 Monahan Way WPAFB, OH 45433-7017 937-255-3969 mark.morano@ Keywords: JMASS, HLA, Modeling and Simulation, SBA, C++ ABSTRACT: The Joint Modeling and Simulation System (JMASS) is a simulation support environment that includes a collection of well-defined, well-documented interface standards to which models can be built. JMASS provides software tools that help users build representations of real-world systems, configure those models, assemble them into simulations, execute those simulations, and process the results. As a tri-service product with nearly 300 registered users, JMASS partners include the U.S. Army, Navy, Air Force, Department of Defense (DoD), Defense Intelligence Agency (DIA), and industry. With object-oriented technology applied throughout, a single set of source code executes in the Windows NT, Sun Solaris, and SGI IRIX computing environments. JMASS currently serves the acquisition, test and evaluation, and scientific and technical intelligence communities with a standard engagement and engineering-level simulation framework. It provides a critical element in the technical portion of the overall simulation based acquisition (SBA) strategy. JMASS will comply with the High Level Architecture (HLA), which provides a common technical framework to ensure interoperability of different simulation components. This paper provides an introduction to the concept, operation, and utility of JMASS. 1. JMASS Background In the early days, there was little formalized modeling and simulation, but Operations Research developed during World War II began to fill in the gap with pure mathematical models. As general-purpose computers came into more widespread use in t