An experiment involving a Group X Training or No-training design does not logically permit conclusions concerning the genetic or nongenetic causes of the main effect of the group differences or their interaction with treatments, nor can such a design reflect on the culture-fairness of the measuring instrument. For related article, see TM 502 302.…

An explanation is sought for the striking apparent failure of the interactions of intelligence and memory factors with socioeconomic status predicted by Jensen's Level I/Level II theory, in a study by Stankov, Horn and Roy (EJ 239 630). It is suggested that Level I ability is a category of narrower abilities involving rote learning and primary…

We need to find out the extent to which individual differences, social class differences and race differences in rates of cognitive development, and differential patterns of relative strength and weakness are attributable to genetically conditioned biological growth factors. The answers to this question might imply differences in our approach to…

The author refutes Humphrey's test of the Spearman hypothesis. A fair test requires that Black and White samples not be selected on any g-correlated variable, including socioeconomic status. Humphrey's factor analysis on test-score means of demographic groups, rather than on individuals, inflates g loadings and biases results. (LMO)