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Bart, William M.; Mertens, Donna M. – Applied Psychological Measurement, 1979
The hierarchical structure of the formal operational period of Piaget's theory of cognitive development was explored through the application of ordering theoretical methods to a set of data that systematically utilized the various formal operational schemes. Results suggested a common structure underlying task performance. (Author/BH)
Descriptors: Cognitive Development, Cognitive Processes, Developmental Tasks, Elementary Secondary Education