IQ is the acronym for intelligent quotient which refers to a score given for several standardized intelligence tests.
IQ is a measure of relative intelligence determined by a standardized test The first of these was developed by French psychologist Alfred Binet in 1905.
He constructed the IQ test, as it would later be called, to determine which children might need additional help in scholarly pursuits. Today, the IQ test is commonly based on some model of the Stanford Binet Intelligence scale.Not all intelligence can be measured by an IQ test. In fact, primarily, an IQ test measures mathematical and spatial reasoning, logical ability, and language understanding.
Thus a person who is speaking English as a second language might score poorly on the language comprehension aspects of a test, and an IQ test would not be an adequate measurement of intelligence.Most children reach the same level of complexity at about the same time, but some children are slower reaching those levels. A 6-year-old child who can do no more than a 3-year-old has a mental age of 3. Wilhelm Stern divided the mental age by the chronological age to get a “Mental Quotient.”