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Psychology of functions and correspondences

Piaget had sometimes been criticized for characterizing preoperational children in terms of the cognitive capacities they lacked, rather than their cognitive accomplishments. A late turn in the development of Piaget's theory saw the emergence of work on the accomplishments of those children within the framework of his psychology of functions and correspondences. This new phase in Piaget's work was less stage-dependent and reflected greater continuity in human development than would be expected in a stage-bound theory. This advance in his work took place toward the end of his very productive life and is sometimes absent from developmental psychology textbooks.