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This is a keynote talk and the second of three papers presented at this conference. The first, “Systems Theory Background for Continuous/Discrete Integration” reviews some of the basic theory needed for this paper. Here we show how continuous and discrete modeling formalisms can be interfaced to support multiformalism modeling and simulation. Such a modeling approach is needed since typically natural systems are modeled in traditional differential equation terms while their controllers are best developed in more recent discrete formalisms. The third paper, “Distributed/Real Time Simulation: Integrating Legacy and Modern Codes”, provides an implementation perspective, addressing the major issue of legacy code reuse and its integration with modern code into advanced distributed computing systems.

We present an approach to wrapping legacy simulation codes with CORBA IDLs based on the DEVS (Discrete Event System Specification) formalism that allows their integration into a heterogeneous, distributed, and collaborative modeling and simulation infrastructure. A family of CORBA-based architectures is discussed that offers a unifying framework enabling legacy codes to be revitalized and execute within modern object-oriented modeling and simulation environments. This is third of a series of papers on interfacing discrete and continuous models presented at this conference. The others are “Systems Theory Background for Continuous/Discrete Integration” and “Interfacing Discrete and Continuous Models for Simulation and Control.”

This is the first (logically, not chronologically) of three papers presented at this conference. We review systems theory background for approaches to integration of continuous and discrete concepts in modeling and simulation. These are concepts are needed for the second and third papers “Interfacing Continuous and Discrete Models for Simulation and Control” and “Distributed/Real Time Simulation: Integrating Legacy and Modern Codes”, respectively.