Many special purpose computer programs for simulation of physical systems are in operation today. In industrial applications, they dominate completely over general purpose simulation environments. To gain runtime efficiency, often on yesterdays computers, the mathematical models of the tailored tools are frequently intertwined with the coded solution procedure, creating a monolithic structure. This makes it difficult to understand and improve the implemented models, also for the original developers. In the field of building simulation, researchers agree that the monolithic programs will be impossible to upgrade and maintain in the long term.
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A 1979 study studied this question.