We've posted enough about the Dunning-Kruger effect that you know the basics: incompetent people don't recognize how incompetent they are because …they're incompetent. That's the simplified version. David Dunning, one of the scientists the effect is named for, designed a TED-Ed lesson that goes a little deeper into the subject.
We are all subject the the Dunning-Kruger effect. People as a whole are very bad at evaluating their own skills and expertise in one area or another due to lack of knowledge. Even experts have a hard time evaluating their relative expertise because, while they may know their own subject well, they have a knowledge gap in evaluating others for comparison. The Dunning-Kruger effect doesn't have to hold us back, but overcoming it requires an open mind and at least some humility. -via Digg