Abstract

Rule-based systems that ask the user and that also allow a not operator to be used in the rules have existed for some time; see, for example, the work of Duda, Gasching, Hart, Konolige, Reboh, Barrett & Slocum (1978). This paper briefly explores an idea of Edmonds (1984) for bringing together such recent developments within logic programming in order to provide a logic-based system with an integral, automatic, strategy for asking. The discussion shows that a simple and natural interpretation of PROLOG can provide a step towards logic-based human-computer co-operation.

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