ABSTRACT
The result of learning and continual practice in a particular domain can lead to what is called expertise. As a rule of thumb, an expert is someone who has had 10 years’ experience in that domain (Simon & Chase, 1973). There is a variety of ways in which expertise can be, and has been, studied. For example, one can look at the development of expertise over time (which we began to look at in the last chapter); one can compare directly experts with novices on a number of dimensions; one can look at individual examples of genius or of “ordinary” experts; or one can find out the kinds of things that experts do well. Nevertheless, whatever aspect one concentrates on, there is at least an implicit comparison between experts and novices.
