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| Journal of Genetic Psychology | 1 |
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| O'Toole, Jean | 1 |
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Peer reviewedMajeres, Raymond L.; O'Toole, Jean – Journal of Genetic Psychology, 1980
Class inclusion problems differing in size of the array and in superordinate class were given to 84 boys and girls in grades 1 through 4 in a first experiment, and 41 boys and girls in grades 3 and 4 in a second experiment. The experiments sought to determine performance variables explaining the developmentally late appearance of class-inclusion…
Descriptors: Classification, Cognitive Development, Conservation (Concept), Elementary Education
