The Dunning-Kruger effect occurs when incompetent people not only fail to realise their incompetence, but consider themselves much more competent than everyone else. Basically – they’re too stupid to know that they’re stupid.
The Dunning-Kruger effect is a slightly more specific case of the bias known as illusory superiority, where people tend to overestimate their good points compared to others. The effect has been shown by experiment in several ways. Dunning and Kruger tested students on a series of criteria such as humour, grammar and logic and compared the actual test results with each student’s estimations of their performance. Those who scored lowest on the test, in the bottom quartile, were found to have “grossly overestimated” their scores. Conversely, those with the highest scores underestimated their performance in comparison to others. (more…)