Binet sought to identify special education pupils, not rate them. Later IQ tests, such as the Wechsler Adult Intelligence Scale (WAIS), became popular. IQ tests were originally scientific ...

Across 14 countries where decades’ worth of average IQ scores of large swaths of the population were available, all had upward swings—some of them dramatic. Children in Japan, for example, gained an ...

Much like Alfred Binet, American psychologist David Wechsler believed that intelligence involved different mental abilities. But he wasn't happy with the limitations of the Stanford-Binet so ...

Later, the French test was developed further in the United States. Common IQ tests used today include the Wechsler Adult Intelligence Scale and the Stanford Binet test. IQ tests use puzzles ...