The Dunning-Kruger Effect is a cognitive-bias. In a very general sense, I’ve come to understand it as the fact that people who know less overestimate their competency whereas highly competent people tend to underestimate themselves. This can then, for example, lead to Imposter Syndrome.
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Keywords: learning
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Source: Justin Kruger, David Dunning (1999): Unskilled and unaware of it.