Knowledge-Based Validity Maintenance for Production Systems

Philip R. Schaefer, Isil H. Bozma, Randall D. Beer

In many problem domains, an action may be taken by an expert, which, due to new inferences or a changing domain situation, should be retracted. To this end, an effective problem solver will need to use some kind of validity-maintenance system, so that it can gracefully recover from invalid previous decisions. Unfortunately, the standard IF/THEN paradigm often used to encode expert behavior does not readily allow the expression and processing of this validity knowledge. We present a new extension to that rule paradigm which can be used to augment production-rule-based systems with validity maintenance capabilities, and demonstrate a straightforward algorithm for its interpretation.

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