Piaget claimed that radical revisions occur three times in development: once at about age one,a second time at about age five,and a third time just before adolescence.

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Piaget actually proposed that radical revisions occur during four developmental stages: sensorimotor (birth-2 years), preoperational (2-7 years), concrete operational (7-12 years), and formal operational (12+ years). There is no specific age at which these revisions occur, as each child develops at their own pace.

Piaget Claimed That Radical Revisions Occur Three Times in Development