Expertise is an elusive thing. It comes from years of experience in a field.  However, it turns out that it doesn’t just accumulate. You need very specific practice and/or useful feedback to develop it.  And the more expertise one has, the better you are able to apply it to situations. Which has implications for what you do and when and how you do it.

Expertise is valuable. The properties of expertise include that it’s compiled away to be essentially automatic. Which implies it’s not accessible for conscious introspection. (Which is why experts quite literally cannot tell you what they do!)  On the other hand, their responses to situations in their area of expertise are likely to be as good as you can get.  They apply mental models they’ve developed to solve problems.

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