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Peer reviewedYouniss, James; Dean, Anne – Child Development, 1974
Descriptors: Age Differences, Conservation (Concept), Cross Cultural Studies, Developmental Psychology
Peer reviewedLiddle, Ian; Wilkinson, J. Eric – British Journal of Educational Psychology, 1987
Describes longitudinal study of the development of understanding of two logical properties of number by 36 children during the first three years of primary school in Glasgow. Piagetian tests and number skills tests were administered to explore the acquisition of number as class and number as order concepts. (Author/LRW)
Descriptors: Classification, Cognitive Development, Concept Formation, Conservation (Concept)
