The Dunning–Kruger Effect
The less you know about a subject, the easier it is to overestimate your own knowledge.
The Dunning–Kruger effect was described in a 1999 study by psychologists David Dunning and Justin Kruger. They found that people with low competence in a field tend to overestimate their ability, while highly competent people often underestimate themselves. The reason is that the knowledge required to judge quality in a given area is often the exact same knowledge required to perform in it. Without the tools to evaluate yourself, you simply don't know what you don't know.
Someone who has just started learning a language might feel almost fluent after a few weeks. By contrast, a translator with ten years of experience often hesitates over subtle nuances. The beginner doesn't see the gaps; the expert does.
The effect helps us understand why strong opinions are often held by those who know the least—and why self-criticism tends to grow alongside expertise.
The effect doesn't mean that uninformed people are stupid. It is about the accuracy of self-assessment, not intelligence.
Think of an area where you feel confident. Ask an expert in that field what they think a beginner most often underestimates.
Low competence makes it difficult to recognize your own lack of competence.
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