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The WISC was first released in 1949 as a downward extension of the adult IQ test. Wechsler revised it in 1974 and it has been revised, updated, modified, and changed three times since then. This paper explores the rationale, purpose, target group, normative samples, reasons for revising the test, reliability methods, and how validity was determined. The writer also comments about the value of the Wechsler Intelligence Scale For Children IV. There are seven sources listed in the bibliography of this six page paper.