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Computer programs based on knowledge developed from consultation with experts on a problem, and the processing and/or formalizing of this knowledge using these programs in such a manner that the problems may be solved.

A computer program that contains aknowledge base and a set of algorithms or rules that infernew facts from knowledge and from incoming data.An expert system is an artificial intelligence applicationthat uses a knowledge base of human expertise to aid insolving problems. The degree of problem solving is based onthe quality of the data and rules obtained from the humanexpert. Expert systems are designed to perform at a humanexpert level. In practice, they will perform both well belowand well above that of an individual expert.The expert system derives its answers by running the knowledgebase through an inference engine, a software program thatinteracts with the user and processes the results from therules and data in the knowledge base.Expert systems are used in applications such as medicaldiagnosis, equipment repair, investment analysis, financial,estate and insurance planning, route scheduling for deliveryvehicles, contract bidding, counseling for self-servicecustomers, production control and training.[Difference from "knowledge-based system"?]