... that composed of many different subtests, varying in both content and difficulty. These subtests included copying a drawing, repeating a string of digits, understanding a story, and so on. The principle behind this was that a person may be able to do well at one or two subtests due to luck or past experiences, but a truly intelligent person would be able to perform well on all the subtests. Therefore intelligence could be measured by a composite score assessing how an individual did on all the tasks set. The diversity of the tasks set ensured that it didn't test a person's specialised talent, but their ability in general. Binet found that the child's test score correlated reasonably well with the child's actual school grades (Gleitman, 1999). This test led to IQ (or intelligence quotient) being developed by Binet and Simon. This test was suitable for children only. To calculate it, you ...

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