I read a great book a few months ago that provides insight into the nature of bias and error. It is Expert Political Judgement, by Philip E. Tetlock. One of Tetlock’s discoveries is that there is a significant correlation between expert prediction accuracy and a cognitive style measure introduced by Isaiah Berlin called "fox" vs "hedgehog". Below the fold I go into more detail on this distinction and present a quiz you can take to determine whether you are Fox or Hedgehog.