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

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Sally's understanding of conservation tasks and object permanence places her in the preoperational stage according to Piaget's theory. However, her inability to solve the three-mountain problem indicates she has not yet developed the ability to perform operations from perspectives other than her own, a characteristic of the preoperational stage, which typically spans from ages 2 to 7.

Sally's Teacher Has Observed That She Seems to Understand Conservation