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.
to 140 Exceptional superior intelligence. 
Exceptional prerequisites for creative activity, excellent managers.
to 130 Highly intelligent intelligence. 
Easily stirs college, can achieve excellent results in creative and managerial activities.
to 120 Abnormal intelligence. 
He is a high school student, and he can get an extraordinary job at high work rates.
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.
to 100 Average intelligence. 
He / she is able to pass the maturitní zkouška, in the work will apply in the middle position.
to 90 Poorly below average intelligence. 
She is able to complete elementary school and apply well in manual professions.
to 80 A lower degree of weakness. 
He can master the elementary school, succeeding in a special school.
to 70 Debility, weakness. 
If well-guided, he can handle a special school.
to 50 Imbecility, a middle degree of weakness. 
Uneducated, but acquiring self-service habits.
to 20
Idiocracy, heavy mildness. 
Unreachable and unbearable