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Dunning-Kruger Effect

In short

The incompetent consider themselves experts; experts doubt themselves.

Ignorance is bold.

Definition​

The Dunning-Kruger effect (Donald Trump effect) describes the cognitive bias in which people with low ability in a particular area tend to overestimate their abilities, while people with high ability tend to underestimate theirs.

The paradox: those who know little do not know that they know little — and therefore consider themselves competent. (Think populists)
Experts, by contrast, are aware of the complexity and underestimate their own abilities.

DE: Dunning-Kruger-Effekt

The Dunning-Kruger effect is closely connected to other cognitive biases:

  • Overconfidence bias: The general tendency to overestimate one's own abilities amplifies the effect in beginners.
  • Impostor syndrome: The feeling of being a "fraud" despite proven competence — the reverse effect in experts.
  • Confirmation bias: The incompetent seek information that confirms their self-assessment instead of accepting objective evaluations.
  • Resistance to learning: Whoever considers themselves competent sees no reason to learn — a vicious circle of ignorance.
  • Social desirability: The wish to appear competent reinforces overconfidence in social situations.
  • Metacognition: A weakness in self-reflection — the incompetent cannot adequately assess their own performance.

Examples​

Programming and Technology​

Beginners who have just written their first lines of code often consider themselves capable developers. They do not yet understand the complexity of software architecture, security, or maintainability. Experienced programmers, by contrast, are aware of these challenges and more often doubt their solutions.

Medical Knowledge​

People with superficial internet knowledge about health topics often overestimate their diagnostic abilities. Experienced doctors, on the other hand, are aware of the complexity of the human body and the limits of their knowledge.

Financial Knowledge and Investing​

Stock-market newcomers, after a few successful trades, often consider themselves investment geniuses. Professional asset managers know the unpredictability of the markets and proceed more cautiously.

Donald Trump as a Prominent Example​

Donald Trump is known for statements like "I know everything about..." or "Nobody knows more about ... than me" — on areas ranging from taxes through technology to military strategy.
This self-assessment shows classic Dunning-Kruger characteristics: the conviction of possessing expert knowledge in practically every field.
Real experts in these fields, by contrast, express themselves far more cautiously and regularly emphasize the limits of their knowledge.

Trump's public appearances demonstrate how overconfidence goes hand in hand with a lack of awareness of one's own incompetence — a textbook example of the effect. From today on it shall be called the Donald Trump effect.

Effects​

  • Overconfidence in beginners and learning resistance
  • Underestimation of their own competence by experts
  • Difficulty in recognizing and correcting one's own incompetence
  • Poor decisions due to overestimated abilities
  • Resistance to feedback and learning opportunities

Counter-Strategies​

  • Regularly seek honest feedback from others, especially from experts.
  • Develop awareness of the limits of your own knowledge ("I know that I know nothing").
  • Continuous learning and openness to new information and criticism.
  • Systematically examine your own mistakes.
  • Develop humility before the complexity of specialist fields.

Sources​