HEARSAY II: A Domain-Independent Framework for Expert Systems

Robert Balzer, Lee Erman, Philip London, Chuck Williams

Hearsay-III is a conceptually simple extenslon of the basic ideas in the Hearsay-II speech-understanding system. That domain-dependent expert system was, in turn, a product of a tradition of increasingly sophisticated production-rule-based expert systems. The use of production systems to encapsulate expert knowledge in manageable and relatively independent chunks has been a strong recurrent theme in Al. These systems have steadily grown more sophisticated in their pattern-match and action languages, and in their conflict-resolution mechanisms. In this paper, we describe the Hearsay-III framework, concentrating on its departures from Hearsay-II.

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