Stub entry: single definition derived from the NIST trustworthy-AI glossary; sector-specific readings not yet documented — contributions welcome.
An expert system is an intelligent computer program that uses knowledge and inference procedures to solve problems that are difficult enough to require significant human expertise for their solution.
NIST AIRC, The Language of Trustworthy AI glossary (public-domain compilation), entry 'expert system', definition attributed to OECD