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Peer reviewedEckstein, Shulamith G.; Shemesh, Michal – Journal of Research in Science Teaching, 1992
Proposes a theoretical model of cognitive development and applies this model to the secondary analysis of two large-scale studies which focus on the acquisition of formal operational schemata by adolescents in the United States and Israel. Results support the "unity" hypothesis of cognitive development that the various schemata of formal…
Descriptors: Age Differences, Cognitive Development, Developmental Stages, Elementary Secondary Education
