A domain expert, also called a subject-matter expert or SME, has specialized knowledge gained through education, practice or sustained experience in a field. In clinical AI, domain experts can identify whether an output preserves medically important context and decisions.
Domain experts help convert real failures into labels, explanations and evaluation criteria that technical teams can use. Their input is most valuable when the workflow records the reasoning behind a judgment instead of reducing it to an unexplained pass or fail label.
ELI5
A domain expert is someone with deep practical knowledge of a particular field. They can recognize important context and consequences that a general reviewer or model may miss.
For example, a clinician can judge whether an AI summary leaves out a medical detail that could change treatment. Recording the reason for that judgment also helps technical teams improve their tests and data.
