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IQ classification is the practice by IQ test publishers of labeling IQ score ranges with category names such as “superior” or “average”. IQ scores have been derived by two different methods since the advent of cognitive ability tests. The current scoring method for all IQ tests is the “deviation IQ”. In this method, an IQ score of 100 means that the test-taker’s performance on the test is at the median level of performance in the sample of test-takers of about the same age used to norm the test. An IQ score of 115 means performance one standard deviation above the median, a score of 85 performance one standard deviation below the median, and so on. Even before IQ tests were invented, there were attempts to classify people into intelligence categories by observing their behavior in daily life. All IQ tests show variation in scores even when the same person takes the same test over and over again.