The overconfidence bias is a common psychological phenomenom where ones tend to surestimate his·her capacity on the path to achievement. This manifest itself with, in exemple, people who're always take longer time to finish a work than what they originaly commited to. We're overconfident on the fact that everything will going absolutely well and that we'll be capable of finishing the work in the time we announced. We could ponderate this with the [[Parkinson law]]. **