Heritability is defined as the proportion of a manifested trait's varience that is due to genetic variation. Sixty-five pairs of twins were employed to investigate the heritability of: (1) short term memory (Jensen's Level 1), operationalized using of modified "digit span" test; (2) the general intellective factor (Jensen's Level II),…

Cognitive deficits in black and other minority children have been assumed, described, and then explained. In direct and indirect ways, the "evidence," especially in the broad public domain has been mounting to suggest a genetic cause for discovered differences between racial groups on test of aptitude and achievement. It is the purpose of the…

This volume of the "Disadvantaged Child" Series presents papers on all aspects of the compensatory education debate, written in large part by many of the educators who played leading roles in this program. Part I provides a comprehensive overall picture of the program. Part II discusses culture-fair testing, "Jensenism" and…