On what may an expert give an opnion as an expert?

Studies have shown that mediastinoscopy is a safe, thorough, and cost-effective diagnostic tool with less risk than some other procedures.

By having the experience just after you needed it most!

expert system architecture need to act like the process expert attempt to do for reasoning based on the given facts. architecture comprise of interface, explanation system, inference engine and...

A expert is when someone is really good at something. In fact, it is when a person has extended knowledge about any given subject, issue, place, person(s), or random thing.

To become an expert, study up on the subject a lot. Get to the point where you know pretty much every thing about the subject without a cheat sheet. At this point, you are an expert.