Klassikalisteks ekspertsüsteemideks on meditsiinilist diagnoosi panna aitavad elektroonilised konsultandid, mis dialoogis kasutajaga võimaldavad jõuda sobiva lahenduseni.
Expert systems may generally be regarded as a particular type of rule-based system, though the expression is also sometimes used quite loosely to mean any knowledge-based system that exhibits relatively intelligent behaviour either due to declarative or procedural mechanisms.
