> People lacking the ability to self-assess is interesting psychologically. People can learn from experience in many other contexts. People can judge their relative position versus other people in many contexts. Why would they be so bad at this particular task? There could be a psychological underpinning.

Is there an existing and relevant phenomenon about people lacking the ability to self-asses, that is true, proven, and not just trivia?

I do believe that people understand all the available information about their skills and performance, and they rate themselves according to it.

E.g. if they are asked about whether they perform good on an IQ test against their classmates they will produce noise (see E.g. the article "I can't let go of.."), and if they have the results of the IQ test, they will be able correctly calculate in which quartile they are.

Is there anything against this view?