In this article, time effects on intelligence test scores have been investigated. In particular, we examined whether the "Flynn effect" is manifest in children from the middle and higher IQ distribution range, measured with a child intelligence test based on information processing principles--the Leiden Diagnostic Test. The test was administered…

Argues that Herrnstein and Murray's cognitive stratification is not intrinsically ominous, since context determines its meaning; their "intelligence" data actually measures educational achievement; environmental effects are underestimated; and analyses and social policy recommendations are bound to the U.S. context. Concludes that…