Sally's teacher has observed that she does understand object permanence, but does not understand not understand conservation tasks, and is not able to solve the three-mountain problem. According to Piaget's theory, Sally is in the

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Sally is in the preoperational stage according to Piaget's theory. This stage typically occurs from ages 2 to 7 and is characterized by the development of language and imagination, but a lack of understanding of conservation tasks and difficulty in seeing perspectives other than one's own, as illustrated by the three-mountain problem. Object permanence is mastered during the earlier sensorimotor stage.

Sally's Teacher Has Observed That She Does Understand Object Permanence