The intelligence quotient (IQ) is a measure that was originally developed by the U.S. military, derived by taking a person's score on the Army Alpha test and dividing it by the person's score on the Army Beta test.

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The concept of the intelligence quotient (IQ) was not originally developed by the U.S. military. It was developed by psychologist William Stern for the scoring of early intelligence tests in the early 20th century, and the Army Alpha and Beta tests were specific intelligence tests developed for the U.S. military during World War I, not the basis for calculating IQ.

The Intelligence Quotient (IQ) Is a Measure That Was Originally