One hundred years have passed since Charles Spearman (1904a, 1904b) published papers in which-it has been said-nearly all the basic formulas that are particularly useful in test theory are found (Gulliksen, 1950), and g, “a general mental ability that enters into every kind of activity requiring mental effort, was discovered” (Jensen, 1998, p. 18). Such thoughts led to a question that led to organizing a conference, which led to writings and the idea of putting the writings together in a book. The question was, “What have we learned about test theory and human intelligence since Spearman wrote those articles that seemed to say it all?” In this chapter, we talk about the part of the question that pertains to human intelligence.
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Horn et al. (2007) studied this question.