Intelligence quotient (IQ) test performance is reported for 93 families restudied 10 years after the Minnesota Transracial Adoption Study in 1975. Results for 426 subjects support the original finding: being reared in the IQ test culture and prevailing school culture benefits all children's IQ scores and academic achievement. (SLD)

The effects of early educational intervention on the attainment of the Piagetian cognitive stage of concrete operations by 86 socioeconomically disadvantaged children aged 5, 6, and 7 years were assessed. The Concept Assessment Kit-Conservation developed by M. L. Goldschmid and P. M. Bentler (1968) was used. (SLD)

Data from the Colorado Adoption Project for 493 first-grade adopted and nonadopted children are used to separate parental intelligence quotient (IQ) from the effects of school environment. Several of the variables show direct environmental associations with reading and mathematics achievement independent of effects of parental IQ. (SLD)

A comparison was made of ability and achievement test results and school grades for 323 pairs of Swedish male and female twins and 740 controls in relation to social background. An interaction effect of sex and social background was found for verbal ability and mathematics test results. (SLD)