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Expertise comes from the Latin experiri, which means to experience something. An expert primarily referred to someone who acquired skills or knowledge through experience. However, the meaning gradually changed to designate a specialist in a specific area.

These specific skills or knowledge defining an expert are usually ratified by a diploma. The role of experts is to provide support for decision-makers (whether in policy, business, or court) by calling on their knowledge to elucidate the consequences of actions in complex areas; for instance, the case for technical matters such as energy policy, health, or scientific policy.

The word expertise appeared in western European countries in the 14th century, first designating people called in front of court in order to help judges to decide on certain matters when ...

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