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Piaget's research involved several kinds of conservation tasks

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He classified children's thinking as concrete operational with respect to a particular task if they could correctly solve the problem and provide a concrete operational reason for their answer. For example, if a child said, "The two circles of marbles are the same because you didn't add any or take any away when you moved them," the response was judged to be concrete operational. Conversely, if a child said, "The two circles are the same, but I don't know why," the response was not classified as concrete operational.
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