The purposes of this paper are to introduce an emerging class of problems called systemof- systems, present the primary traits of the class, and then described the relevant implications for the aerospace design community. Two primary traits, evolutionary and emergent behavior, are highlighted since they call attention to a network-of-systems, dynamic-behavior focus as opposed to an individual system, static-behavior focus. Further, methodological needs for investigation of these traits lie outside present capability in the community. To explore these implications in depth, the casting of future transportation concepts as a system-of-systems is described. A recently developed “proto-method” for this class of problems is presented and explored in the context of the transportation domain, including promising approaches for building effective modeling and simulation. The casting of civil transportation as a system-of-systems problem is important as much of the literature on system-of-systems (limited as it is) resides primarily in the defense systems domain.
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