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The Cambridge Handbook of Intelligence: Intelligence and the Cognitive Unconscious

Intelligence tests were originally created with the practical goal of identifying students in need of alternative education (Binet & Simon, 1916). Because intelligence tests were originally devised to predict school grades, the items were intentionally designed to measure a general ability to profit from explicit instruction, concentrate on a task, and engage in intellectual material. Indeed, research shows that such a general ability does seem to exist. Over a century ago, Spearman (1904) discovered that when a wide range of cognitive tests