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Sinnott, J. D. – Human Development, 1975
Formal and familiar materials were used to test Piagetian classification and formal operational abilities in two groups of educated adults: one group aged 30-38 and the other aged 57-82 years. Subjects did not show mastery of the tasks. Results suggest a new model of cognitive lifespan development. (Author/MS)
Descriptors: Adult Development, Adults, Age Differences, Classification