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Van Harlingen, David L. – 1978
This researcher investigated two problems: (1) the accuracy and validity of instruments which measure Piagetian levels of thought; and (2) the need for more detailed models of concrete and formal operational structures, both as they develop and consolidate, and in their most highly developed state. Several tasks such as the Piagetian correlations…
Descriptors: Behavior Theories, Cognitive Processes, Educational Research, Instrumentation
