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<p>An overview is given of Q+, an interactive tool for performance modeling that uses graphical input and visual output. Two major enhancements are a subnetwork capability for structuring models hierarchically and an integrated expression capability. New capabilities are custom icons and temporal browsing. With a Q+ icon palette, users can draw their own icons and manipulate existing ones. The browser allows browsing, editing and updating Q+ information, which can be textual or graphical. Automatic model building, operations management, and experimental design with Q+ are discussed.</p>
interactive visual modelling; automatic model building; Q+; interactive tool; performance modeling; graphical input; visual output; subnetwork; integrated expression; custom icons; temporal browsing; icon palette; editing; updating; operations management; experimental design; computer graphics; interactive systems; performance evaluation; program testing; software tools

L. D. Rubin, T. D. Kontogiorgos, C. A. Funka-Lea and R. J. Morris, "Interactive Visual Modeling for Performance," in IEEE Software, vol. 8, no. , pp. 58-68, 1991.
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