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The subject of Expert Systems under the broader heading of intelligent knowledge‐based systems (IKBS) has attracted considerable attention over the last few years and is a central theme in the initiatives of the Alvey Programme for Advanced Information Technology, and the Science and Engineering Research Council IKBS programme. The British Computer Society Expert Systems Specialist Group (BCS ESSG) was established to provide a focus for those concerned with the development of this new area of computing. There are several definitions as to what an Expert System is, one considered definition being that provided by the ESSG:
A. S. Pollitt (Tue,) studied this question.