![]() ![]() Individuals can vary in IQ classification from one occasion to another both because numerical IQ scores can vary each time an individual takes a test and because not all test publishers use the same category labels for IQ classification. (IQ score table data and pupil pseudonyms adapted from description of KABC-II norming study cited in Kaufman 2009. IQ scores can vary for the same person, so a person does not always belong to the same IQ score range each time the person is tested. Test publishers have not agreed on uniform designations for IQ score classifications. All IQ tests show variance in scores even for the same test-taker retested on the same test, and also variance in scores for the same test-taker among IQ tests from different publishers. Both intelligence classification by observation of behavior outside the testing room and classification by IQ testing depend on the definition of "intelligence" relevant to a particular case and on the reliability and error of estimation in the classification procedure. ![]() Those other forms of behavioral observation are still important for validating classifications based on IQ tests. ![]() IQ classification is the practice by IQ test publishers of designating IQ score ranges as various categories with labels such as "superior" or "average." IQ classification was preceded historically by attempts to classify human beings by general ability based on other forms of behavioral observation. ![]()
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