Abstract
The Milwaukee Project (Garber, 1988) was a longitudinal investigation of the risk for deceleration in the rate of mental development with increasing age. Arthur Jensen (1989) incorrectly characterized the experimental intervention as an attempt to “raise IQ” and hypothesized that a substantial portion of the IQ difference between treated and untreated children is most plausibly explained as a specific training effect on the item content of the IQ tests rather than a real difference in general intelligence or g. A full description of the stimulation program and a review of outcome data are presented. The evidence cited by Jensen in support of his hypothesis was evaluated and found to be wanting. Analyses indicated that the transfer of training to test items may have inflated the mean IQ level for experimental children by as much as 6 points, but the major effect of the intervention was the prevention of deceleration in the rate of mental development of a magnitude of about 22 IQ points.
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