EXPERT: Knows How to Get Results

An expert is a person with proven knowledge or skill adequate to achieve a desired endpoint in a specific field.

An essential attribute of an expert is the accuracy of estimations of resources—time, money, people, etc.—needed to achieve a particular endpoint.

An expert might not be a professional—someone certified by an authority as one having knowledge or skill in a particular field. Although the two often overlap in one person, some professionals are not experts, and some experts are not professionals.

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