Being able to judge the accuracy of one's work is an important facet of human decision making. Psychological investigation into self-assessment has stemmed largely from the experimental cognitive tradition and mainly concentrates on probabilistic accounts related to rational thinking. A major aspect of this work relates to the confidence exhibited by individuals when assessing their decisions, and is thus often referred to as the 'confidence paradigm'. Another perspective has emerged in the last decade from the work of Differentialists. A robust outcome of these investigations is the...