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Campbell, Frances A.; Ramey, Craig T. – Intelligence, 1990
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)
Descriptors: Academic Achievement, Cognitive Development, Cognitive Tests, Comparative Testing