Since Piaget's original demonstrations, further progress has necessitated the standardization of these problems with materials, questions, procedures, and scoring so clearly specified that examiners can replicate one another's results. Such standardization permits the explanation ofthe general applicability of Piaget's concepts. Standardized tests have been developed for measuring object permanence, egocentricity, and role-taking skills. The Concept Assessment Kit, for example, provides six standard conservation tasks for which comparison data (norms) are available for children in several widely diverse cultures. The relative conceptual attainments ofan individual child (or culture) can be measured. Those who attain such basic skills as conservation early have been shown to be advanced in many other educational and cognitive achievements.
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