All people possess certain mental faculties which distinguish them from other kinds of biomass, and these abilities variate throughout life. The intelligence is a characteristic which all individuals possess. From this point of view, people differ from each other only in intelligence size.

Intellectual Test or Specificity of One Quiz

Intellectual tests which are widely used in the different countries for definition of level of mental abilities became one of approaches to the analysis of individual distinctions. Results of testing routinely represent in the form of IQ (intellectual development quotient). At correct use intelligence tests yield the authentic diagnostic information on mental abilities of homo sapiens which differently could be overestimated or underestimated.

Intellectual tests are compounded for adults or children by incorporation of questions which corresponds to intellectual possibilities for the certain age of life. Also, IQ tests were awakely used for the characteristic of resemblance and distinctions between separate bunches of people.

Testing can be useful at acceptance of pedagogical or clinical decisions or for professional selection only in the event that its results are reliable and significant (are valid, relevant). Reliability of the quiz is defined by stability of received results; it estimate by comparison of results of testing of the same persons at various times and at use of various variants of the quiz. Those personality questions in which it's not possible to receive stable answers, should be excluded.

Maintenance of a validity of the IQ tests — an uneasy problem because of argumentativeness of the definition of concept «intelligence». Thus, intelligence tests are under construction on the basis of very screening. Intelligence tests differ from personality quiz because the quiz is some kind of «warm-up for a brain».

Some IQ characteristics are well studied. This index is stable throughout all life though there are also exceptions. Intelligence measurement in infancy does not correlate with IQ in average age. The average index of performance of test tasks tends to increase in the teenage season and in the beginning of adult life. Some decrease descends after 60 years, especially at the expense of tasks which demand flexibility of thinking.

Men and women on the average don't differ on IQ, but nevertheless differ... For example, girls more better carry out verbal tasks (selection of synonyms, color distinctions), boys — tasks dimensional (comparison of drawings, visualization of objects), thus quizzes for girls need to be compounded with taking into account their weak qualities, the simulated condition is applicable and to boys. Also, have been revealed both distinctions between racial and ethnic groups.