The predictive value of IQ

This article reviews findings on the predictive validity of psychometric te sts of intelligence. The article is divided into five major parts. In the f irst part, the issues with which the article deals are introduced. In the s econd part, we discuss what psychologists can learn about the predictive va lidity of intelligence tests from results obtained in the established marke t economies. Intelligence quotient (IQ) is considered in relation to educat ional achievement, employment prospects and wealth generation, career outco mes, and well-being. In the third part, the intelligence tests (primarily f or infants and children) that yield the IQ scores are discussed. In the fou rth part, constraints are presented on the interpretations of findings, inc luding cross-cultural issues. We conclude that conventional tests of intell igence can be useful but only if they are interpreted very carefully taking into account the factors that can affect them, and in conjunction with oth er measures.