Interactive computation

Scott A. Smolka, Peter Wegner

Interaction is an emerging paradigm of models of computation that re?ects the shift in technology from mainframes to networks of intelligent agents, from number-crunching to embedded systems to graphical user interfaces, andfromprocedure-orientedto object-baseddistributedsystems.Interacti- based models di?er from the Turing-machine-basedalgorithmic models of the 1960s in interesting and useful ways: ProblemSolving:Models ofinteractioncapturethenotionofperforminga task or providing a service,ratherthan algorithmicallyproducing outputs from inputs. Observable Behavior: In models of interaction, a computing component is modeled not as a functional transformation from input to output, but rather in terms of observable behavior consisting of interaction steps. For example, interactions may consist of interleaved inputs and outputs m- eled by dynamic streams; future input values can depend...

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