“Expertise is said to be acquired through study, education, or experience. However, expertise is often conferred through perception rather than through objective means.
A house painter, for example, is likely to acquire expertise from experience and training, while a nuclear physicist gains the expert appellation by virtue of advanced degrees.
We are looking for someone who can make a decision or give a qualified opinion about how to act relative to some set of circumstances or data. We are looking for someone who knows the facts-someone who has knowledge that we don’t. In the end, it may be that you need not define an expert to identify one. Perhaps we just know, or intuit, when we find an expert and need not worry about the definition.”
Source: Everybody’s an Expert: Finding Business Experts Online, By Roberta Brody & Marydee Ojala; Online, May 1 2008