ABSTRACT
This chapter discusses fundamentals of various designs on how to achieve the goals through the standardization of Discrete Event System Specification (DEVS) models and their simulators. The formalism was defined to bring coherence to the field of discrete-event M&S by using an organized system-theoretical framework. Instead, the DEVS theoretical foundation makes it independent of the various programming languages and hardware platforms. Within a Study Group of the Simulation Interoperability Standards Organization, a standard has been under development to support interoperability of DEVS models implemented in different platforms as well as with legacy simulations. Fundamental issues such as model credibility and interoperation have moved to the front and center under the impetus of the High Level Architecture (HLA) standard. The HLA focused on interoperability of existing geographically dispersed M&S assets, and it was initially built focusing on defense applications.
