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Halford, Graeme S.; Leitch, Elizabeth – 1988
Three studies were conducted to investigate reasons for the difficulties that children under 5 years of age experience with class inclusion tasks. The studies tested the claim that such tasks have a structural complexity that is beyond the children's processing ability. In experiment 1, class inclusion tasks were compared with other classification…
Descriptors: Age Differences, Classification, Cognitive Ability, Difficulty Level
Peer reviewedEtaugh, Claire F.; Pope, Barbara K. – Child Development, 1974
Descriptors: Age Differences, Difficulty Level, Discrimination Learning, Elementary School Students
