The Dunning-Kruger Effect

Surface

People with limited knowledge in a domain tend to dramatically overestimate their own competence. Meanwhile, genuine experts often underestimate theirs. It's not about stupidity, it's about the inability to recognize what you don't know.

Middle

Dunning and Kruger's 1999 study showed that the poorest performers rated themselves near the top. The cruel irony: the very skills you need to produce correct judgments are the same skills you need to recognize correct judgments. Incompetence robs you of the ability to see incompetence.

Deep

This effect explains why beginners are often overconfident while experts are plagued by doubt. True expertise begins the moment you realize how much you don't know, which is why the most dangerous person in any room is often the one who has just learned enough to feel certain.