Piaget's work on conservation implies that he had not really measured the children's ability to conserve, because the questions were misleading. This means it lacks:

Question

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Piaget's work may lack validity because the questions used to measure conservation were confusing and could have been interpreted in different ways by children. This suggests that the study may not have actually measured children's ability to conserve, and therefore lacks validity.

Piaget's Work on Conservation Implies That He Had Not Really