TEST: A Model-driven Application Shell

Gary S. Kahn, AI Kepner, Jeff Pepper

TEST (Troubleshooting Expert System Tool) is an application shell that provides a domain-independent diagnostic problem solver together with a library of schematic prototypes. TEST fills a design niche halfway between rule-based and causal-model approaches. This approach has resulted in a design that meets several functional requirements for an effective troubleshooting shell. Most critically, TEST can represent both the impact of failure-modes on a machine or system of interest, as well as the heurist!c problem-solving behavior which can lead to rapid conclusions. This paper provides an overview of TEST’s approach to diagnosis. As a special purpose application shell, TEST provides considerably more leverage to developers than can be gained through the use of general purpose heuristic classification systems.

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