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Domain Expert. The term domain expert is frequently used in expert systems software development, and there the term always refers to the domain other than the software domain. A domain expert is a person with special knowledge or skills in a particular area of endeavor.

Used frequently in the technical arena, this refers to the expertise a consultant possesses in a particular area. The term “deep domain” just adds that extra emphasis, that this person doesn’t just know what they are talking about, but they really, really know what they are talking about.

A subject-matter expert (SME) or domain expert is a person who is an authority in a particular area or topic. The term domain expert is frequently used in expert systems software development, and there the term always refers to the domain other than the software domain