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Expertise: what, where, and when.

All fields of study are thought to pursue understanding of their subject matter, and most such fields are thought to have experts who are expected to possess insight into the underlying structure of knowledge within their field. Yet being an expert within one’s field usually means being an expert in a small subset of the field and often implies little about one’s expertise outside the narrow range. Worse yet, there are persuasive arguments that experts in some fields lack the abilities they claim to have. This short article will briefly sketch features that are common to experts along with mechanisms underlying expertise, provide a few findings that help underscore differences between domains, and finally confront arguments against certain types of expertise.