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註釋Abstract: "Recently there has been a growing realization among researchers and practioners [sic] that current technologies do not adequately support mathematical modeling 'in the large.' In this paper we discuss a technology called ASCEND, which addresses this issue. We describe two aspects of the technology: a modeling language and an interactive model-building environment. The ASCEND language is structured, declarative, and strongly-typed and incorporates object-oriented extensions. The interactive environment is based on the notion of a concurrent set of tools which reflect the various phases of ASCEND modeling. These tools do not enforce a strict sequence of operations, but rather have been designed to support the flexible access implied by declaratively specified models