IQ/achievement Tests
IQ tests purport to be measures of intelligence, while achievement tests are measures of the use and level of development of use of the ability. IQ (or cognitive) tests and achievement tests are common norm-referenced tests. In these types of tests, a series of tasks is presented to the person being evaluated, and the person's responses are graded according to carefully prescribed guidelines. After the test is completed, the results can be compiled and compared to the responses of a norm group, usually composed of people at the same age or grade level as the person being evaluated. IQ tests which contain a series of tasks typically divide the tasks into verbal (relying on the use of language) and performance, or non-verbal (relying on eye–hand types of tasks, or use of symbols or objects). Examples of verbal IQ test tasks are vocabulary and information (answering general knowledge questions). Non-verbal examples are timed completion of puzzles (object assembly) and identifying images which fit a pattern (matrix reasoning).
IQ tests (e.g., WAIS-IV, WISC-IV, Cattell Culture Fair III, Woodcock-Johnson Tests of Cognitive Abilities-III, Stanford-Binet Intelligence Scales V) and academic achievement tests (e.g. WIAT, WRAT, Woodcock-Johnson Tests of Achievement-III) are designed to be administered to either an individual (by a trained evaluator) or to a group of people (paper and pencil tests). The individually administered tests tend to be more comprehensive, more reliable, more valid and generally to have better psychometric characteristics than group-administered tests. However, individually administered tests are more expensive to administer because of the need for a trained administrator (psychologist, school psychologist, or psychometrician).
Read more about this topic: Psychological Tests, Types of Psychological Tests
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