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The following essay will delve into the development reliability and validity of the IQ test IQ tests are multi-faceted and have channeled into various levels of human intelligence and psychological traits Therefore this essay will specifically deal with the area propagated by Binet and his colleagues The most widely used tests by psychologists both in schools and in health settings is the Stanford-Binet test This test is the modern version of a test devised in the early 1900s by Binet and Simon at the request of the Paris school system There purpose was to identify children who were unable to learn in traditional classroom settings Binet and Simon believed that intelligence was malleable and that childrens academic performance could be improved with special programs They took an innovative approach to the construction of their test Binet and Simon asserted that to differentiate among individuals one had to sample higher mental functions such as comprehension reasoning and judgement They developed an array of intellectual tasks involving such things as the ability to attend to something and the ability to recognize logical absurdities In addition Binet and Simon recognized and built into their test the chronology of childrens learning Therefore as children grow older they are able to solve increasingly complex problems In later revisions based on the criterion that any test item must effectively sort children by age Binet and Simon selected items to reflect childrens competence at different age levels In refining their tests Binet and Simon administered aptitude question to large groups of children whose teachers had identified them as either bright or dull The knowledge gained by the aptitude questions allowed Binet and Simon to differentiate between these two groups Binet originated the concept of mental age which is an index of a childs actual performance level in contrast to their true age The mental age concept was later superseded by the intelligence quotient for which the following formula was
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