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  • The notion that the physical characteristics of objects do not change even if there are superficial changes in appearance. According to Jean Piaget (1896 1980), children do not understand the concept of conservation until they reach the concrete operational stage of development, which occurs at about the age of seven. For example, children in the preoperational stage are not able to recognize that if you pour a long and thin glass of water into a shorter and wider cup, the quantity of liquid stays the same. The child in the preoperational stage, typically a preschooler, believes that the tall and thin glass contains more liquid than the shorter, wider cup. Piaget believed that conservation represents a significant advance in cognitive development, setting the stage for ...

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