The first scientist to try to measure intelligence was the French psychologist and inventor Alfred Binet (July 8, 1857 – November 18, 1911). The first test was created and published (co-author was Theodor Simon) in 1905 (under the name of Binet-Simon’s Intelligence Scale).

His test was used to find students who needed extraordinary help in teaching because they did not manage a common teaching material. The crucial importance of his intelligence tests was manifested during the First World War, when the United States used it in selecting and distributing soldiers.

IQ Score/values:

The following table describes clearly the individual IQ levels and their percentages in the population.

 

IQ Description and predictions of the individual % of people
over 140 Intelligence of geniuses. 
The absolute prerequisites for creative activity determine the direction of knowledge for others.
0.2%
to 140 Exceptional superior intelligence. 
Exceptional prerequisites for creative activity, excellent managers.
2.8%
to 130 Highly intelligent intelligence. 
Easily stirs college, can achieve excellent results in creative and managerial activities.
6%
to 120 Abnormal intelligence. 
He is a high school student, and he can get an extraordinary job at high work rates.
12%
to 110 High average intelligence. 
It is only with difficulty that the university colleges. Consistency and industriousness can earn the social rank of the previous category.
25%
to 100 Average intelligence. 
He / she is able to pass the maturitní zkouška, in the work will apply in the middle position.
25%
to 90 Poorly below average intelligence. 
She is able to complete elementary school and apply well in manual professions.
10%
to 80 A lower degree of weakness. 
He can master the elementary school, succeeding in a special school.
10%
to 70 Debility, weakness. 
If well-guided, he can handle a special school.
6.8%
to 50 Imbecility, a middle degree of weakness. 
Uneducated, but acquiring self-service habits.
2%
to 20
Idiocracy, heavy mildness. 
Unreachable and unbearable
0.2%