According to Kohlberg, which of Piaget's stages must be reached for a person to use postconventional reasoning?

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Kohlberg's theory of moral development suggests that for an individual to reach the stage of postconventional reasoning, they must have achieved the stage of formal operations in Piaget's theory of cognitive development. This stage allows for abstract thinking necessary for understanding and applying universal ethical principles.

According to Kohlberg, Which of Piaget's Stages Must Be Reached