Professor Timon of Stanford University published the Stanford-Binet Intelligence Scale in 19 16. It was further modified in 1930, 1962, 1972 and 1986 respectively.

The outstanding progress of the second edition of Stanford-Binet Intelligence Scale is to introduce the concept of IQ and apply it to the whole world. IQ indicates the relative level of intelligence and becomes an index to compare children's intelligence.

The calculation formula of ratio IQ: IQ = (intellectual age/actual age) x 100.

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1. Reference age, when intelligence grows to a certain extent, with the growth of age, although intelligence does not decline, IQ will decline. This is not in line with the actual situation.

2. Only providing comprehensive measurement of intelligence can only give people a general concept of intelligence.

The essential difference between IQ and deviant IQ

The basic assumption of ratio IQ is that intellectual development is in direct proportion to age growth, which is a linear relationship. However, with the growth of people's age, IQ stops growing, and enters a platform period around the age of 26, so IQ is not suitable for old age.

Deviation IQ adopts new methods, giving up intellectual age and using deviation. The basic principle is to regard the intelligence distribution of children of every age as normal distribution, and the intelligence level of the subjects is determined by the deviation from the intelligence distribution of their peers.