Every claim below was made in this piece, quoted word for word and numbered in the order the piece makes them, so you can read it there rather than take our word for it. The sentence above each quote is our reading of the claim, not their wording. Each quote was checked against a stored copy of the page at build time; where the two differ, the quote is the fact.
Our reading
Mental modelCircle of competence
Their wordsThe size of that circle is not important. What is important is knowing when you are approaching the perimeter.
Our reading
Mental modelCircle of competence
Their wordsWithin your circle of competence, you operate with an advantage. As you approach the perimeter (the limitations of your knowledge), your advantage starts to reduce. As you cross the perimeter, not only does your advantage vanish, but it transfers to other people.
Our reading
Mental modelCircle of competence
Their wordsAs we cross the perimeter from what we know to what we don’t, confidence does not diminish as fast as competence. The biggest risk when operating outside of your circle of competence is what you don’t see.
Our reading
Mental modelCircle of competence
Their wordsIt did not hurt Mrs. B to have such a narrow area of competence. In fact, one could argue the opposite. Her rigid devotion to that area allowed her to focus.
Our reading
Mental modelCircle of competence
Their wordsTo improve the odds of success in life and business, understand the perimeter of your circle of competence and operate well inside. Over time, work to expand that circle, but don’t fool yourself about where the perimeter is, and never be afraid to say, “I don’t know.”
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The other pieces are the ones whose claims are worded most like this one's. That measures language, not agreement: they may argue the opposite.