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IQ scores can differ to some degree for the same person on different IQ tests, so a person does not always belong to the same IQ score range each time the person is tested (IQ score table data and pupil pseudonyms adapted from description of KABC-II norming study cited in Kaufman 2009). [12] [13] Pupil KABC-II WISC-III WJ-III Asher: 90: 95: 111 ...
An intelligence quotient (IQ) is a total score derived from a set of standardized tests or subtests designed to assess human intelligence. [1] Originally, IQ was a score obtained by dividing a person's mental age score, obtained by administering an intelligence test, by the person's chronological age, both expressed in terms of years and months.
Borderline intellectual functioning, previously called borderline mental retardation (in the ICD-8), [1] is a categorization of intelligence wherein a person has below average cognitive ability (generally an IQ of 70–85), [2] but the deficit is not as severe as intellectual disability (below 70). It is sometimes called below average IQ (BAIQ).
Terman's test was the first widely used mental test to report scores in "intelligence quotient" form ("mental age" divided by chronological age, multiplied by 100). Current tests are scored in "deviation IQ" form, with a performance level by a test-taker two standard deviations below the median score for the test-takers age group defined as IQ 70.
The current version of the test, the WAIS-IV, which was released in 2008, is composed of 10 core subtests and five supplemental subtests, with the 10 core subtests yielding scaled scores that sum to derive the Full Scale IQ. With the WAIS-IV, the verbal/performance IQ scores from previous versions were removed and replaced by the index scores.
Various high-IQ societies also accept this test for admission into their ranks; for example, the Triple Nine Society accepts a minimum qualifying score of 151 for Form L or M, 149 for Form L-M if taken in 1986 or earlier, 149 for SB-IV, and 146 for SB-V; in all cases the applicant must have been at least 16 years old at the date of the test.
In addition to VIQ, PIQ, and FSIQ scores, four new index scores were introduced: the Verbal Comprehension Index (VCI), the Perceptual Organization Index (POI), the Freedom from Distractibility Index (FDI), and the Processing Speed Index (PSI). The WISC-IV was produced in 2003. The WISC-V was published in 2014. The WISC-V has a total of 21 subtests.
The test is currently in its second edition, published in 2015. [2]Both editions are suitable for evaluation of intellectual giftedness, [3] and high scores are accepted as qualifying evidence for high IQ societies such as Intertel (min. IQ ≥ 135) and American Mensa (min. IQ ≥ 130).