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IQ tests are among the most commonly administered psychological tests. In order to understand what these scores really mean, it is essential to look at exactly how these test scores are calculated. Today, many tests are standardized and scores are derived by comparing individual performance against the norms for the individual's age group. While many tests utilize similar methods to derive their scores, it is also important to note that each test is different and scoring methods may not be the same from one test to another.


Philosophers often divide knowledge up into three broad domains: personal, procedural, and propositional. Personal knowledge relates to firsthand experience, idiosyncratic preferences, and autobiographical facts. Procedural knowledge refers to knowledge how to do something, such as how to play basketball or ride a bike. Propositional knowledge refers to general truth claims about the world and how we know it. An important difference between philosophy and psychology can be seen in these various kinds of knowledge. Whereas philosophers have generally been concerned with general propositional knowledge, psychologists have generally concerned themselves with how people acquire personal and procedural knowledge.