Who used the word IQ first?

Assessment of Intelligence:

• In 1905, Alfred Binet and Theodore Simon made the first successful attempt to formally measure intelligence.
• In 1908, when the scale was revised, they gave the concept of Mental Age (MA), which is a measure of a person’s intellectual development relative to people of her/his age group

Important Points

In 1912, William Stern, a German psychologist, devised the concept of Intelligence Quotient (IQ).

• IQ refers to mental age divided by chronological age and multiplied by 100.
• IQ = \(\frac{MA}{CA} \times\) 100
• The number 100 is used as a multiplier to avoid the decimal point.
• When the MA equals the CA, the IQ equals 100.
• If MA is more than the CA, IQ is more than 100.
• IQ becomes less than 100 when the MA is less than the CA.

Hence, Concept of I.Q. was given by William Stern.

Hint Terman in 1916 revised the test and introduced the application of the term intelligence quotient