IQ term appeared in 1912, and stood for intelligence quotient in the works of William Stern, German psychologist. The author used this term to define the results of tests on the level of intellectual development. During the period since the introduction of the term and to this day, there appeared a lot of techniques for the determination of the intelligence coefficient, many studies on this subject, collected the plenty of data containing IQ of numerous people.

Inside the research on human intelligence, there are many theories. R. Cattell distinguished two types of intelligence: flexible and "crystallized", while Charles Spearman and R. Sternberg distinguished four, while three axes inside intelligence that may possibly have up to 120 kinds of reasoning combinations, can be identified by the classification of D. Gilford.

Systematizing scientific theories, we can definitely talk about three aspects of intellect:
  • Verbal
  • Creativity
  • Practical

And consider other methods and means of such aspects as the emotional and social intelligence.

In everyday life, evaluation by IQ tests is used by many companies for staff selection, serves as an indicator for clinical diagnostics, while in academic circles it is correlated with age, sex, level of life, income, genetic factor, the level of happiness, and almost every new factor significant for psychology . There is a separate line of the study of the average IQ for different countries.

So what is behind this abbreviation and a number near it?

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The first test to determine the level of intelligence appeared in 1905. Alfred Binet and Theodore Simo developed tests for students, which eventually became a pioneer among the methods to assess intelligence. Following this procedure, a large number of different tests and models of human intelligence were created.

The most popular tests for determining the level of IQ tests are those made by H. Eysenck, J. Wechsler, D. Raven and R. Amthauer. Despite the variety of tests, there is no common standard of their values. Therefore, average IQ value for Wechsler system will be about 90-109 points, while it will be 100-120 points by Eysenck .

There is a table of ratio between Wechsler IQ level and performance:
125 Ph.Ds Those who have the average IQ level are likely to have average grades in school and are not among the best students. But in this case, those will be able to achieve great accomplishments at the appropriate level of effort.
114 Graduates
105-110 Uncomplete higher education
100-105 Office and sales workers
100 Those, who have finished high school, qualified workers (e.g. electricians For example, there are a lot of people with average IQ among the Nobel Laureates. Gender is not related with IQ performance , but the relationship between criminal tendencies and indicators of intelligence can be traced.

It is interesting, that in 2006, there was composed a rating of countries with highest IQ.
95 Enrolled in high school groups, but have not completed it
90-95 Workers of average qualification (e.g. tractor-drivers, factory workers)
90 Those, who have finished school without upper classes completion (8 years)
80-85 Those, who have not completed 8 years of school
75 Those, who have 50 % chance to go to upper classes of school
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Those who have average IQ level are likely to have average grades in school and are not among the best students. But in this case, those will be able to achieve great accomplishments at the appropriate level of effort. For example, there are people with average IQ among the Nobel Prize winners. Gender is not related with IQ, but the relationship between criminal tendencies and indicators of intelligence can be traced.

Intelligence stands for success in life, the bearers of high IQ are more likely to go to a prestigious university, get a well-paid job and move high on the career ladder. The researchers also obtained interesting results on the private front: people with high intelligence are less likely to get divorced and usually have a happier marriage. Those who have high scores also showed a good ability to learn and mastered additional professions well.

For a long time, there had been a version that intelligence reaches its maximum at the beginning of middle age, and then there is the inevitable decline in its performance. But recent studies show that the IQ level remains unchanged and can be increased through enhanced mental work. The largest contribution to the development of IQ is made by working memory, BrainApps training system will help you to develop and strengthen working memory, preserve and enhance the value of IQ. Studies have shown that intellectual ability and productivity are linearly dependent, high IQ values lead to greater productivity.