A domain expert or subject matter expert (SME) is a person with special knowledge or skills in a particular area. The term can also refer to someone particularly familiar with a group, or its work habits, and can act as a usability evaluator.

The most common use of the term is in the field of Artificial Intelligence (AI), especially for expert systems, where the attempt is made to deduce and codify the expertise as a series of rules.

==Examples==

*A truck driver is an expert in trucking and the needs truckers have for the types of systems that truckers might use, such as delivery system or inventory system system. *A manager may be a domain expert for a project management system. *An accountant is a domain expert for accounting systems. *A programmer is a domain expert for his/her field of programming.

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