Since the beginning of Psychology as a field of study, psychologists have been categorizing people: as introverts and extroverts, in terms of their conscientiousness, their openness to experience, and so on. While many of these classification systems examine general personality, a number of classifications look specifically at the way people think—what is sometimes called their cognitive style. When solving problems, for example, some people like to focus on getting the evidence that is most likely to be relevant to the problem at hand, while others have a tendency to “think out of the box.”