Much expert knowledge is not accessible to the consciousness of the expert. When asked to give explanations for a decision, experts frequently struggle.
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Bright or Dull Cows𓍯 describes how tacit knowledge can seem to its owner as perception rather than thought.
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Foundational text was Polyani's *Personal Knowledge 
* (1958).
Gary Klein's *Sources of Power * is about expert decision-making and breaks out three (I think) kinds of tacit knowledge they use.
The original "Bright or Dull" cows essay was written for _Better Software_ magazine under the title "Tacit Knowledge" .