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MR / Schenectady, NY.Photo 3 of a sequence of 3 .Boy (5, African-American) points to tall 8-ounce glass, believing it holds more juice than short 8-ounce glass..This sequence illustrates one aspect of Piaget's theory of cognitive development in the pre-operational child (aged approximately 2 - 7). One characateristic of the pre-operational child is the inability to conserve, that is understand that the amount of substance remains the same despite a change in shape/form. When the 8 ounces of juice in a short glass is poured into an 8-ounce taller glass, the child believes that the taller glass contains more juice than the shorter one..MR: AD-pkf Pal2..©Ellen B. Senisi