The following scale resulted for classifying IQ scores:ĩ0 – 109 – Average or normal intelligenceħ0 – 79 – Borderline deficiency in intelligenceĩ5.5% of IQ scores fall between 70 and 130ĩ9.6% of IQ scores fall between 60 and 140Īn IQ under 70 is considered as “mental retardation” or limited mental ability. ![]() Terman revised the Simon-Binet IQ Scale, and in 1916 published the Stanford Revision of the Binet-Simon Scale of Intelligence (also known as the Stanford-Binet). Sometime later, “intelligence quotient,” or “IQ,” entered our vocabulary. In 1904 psychologist Alfred Binet was commissioned by the French government to create a testing system to differentiate intellectually normal children from those who were inferior.įrom Binet’s work the IQ scale called the “Binet Scale,” (and later the “Simon-Binet Scale”) was developed. ![]() Intelligence testing was first done on a large scale before either of these dates. What does the IQ scale measure? What is an average score? How high can an IQ be? Here are some answers to these and other questions.įirst of all, the concept of IQ was developed by either the German psychologist and philosopher Wilhelm Stern in 1912, or by Lewis Terman in 1916, depending on which sources you consult.
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