Piaget's theory of stages of moral development.

(1) Egocentric stage (2 ~ 5 years old): The stage without moral rules, the rules are not binding on children. In this period, children can't distinguish themselves from the external environment, but regard the external environment as an extension of themselves. These rules are not binding on him. Piaget believes that children are still "lawless" before the age of five, regardless of the relationship between people and me, but "self-centered" to consider problems.

(2) Authority stage (5-8 years old): Also known as heteronomous morality stage, children in this period obey external rules, accept norms designated by authority, regard human-made norms as fixed, and judge right or wrong only according to the consequences of their own actions.

(3) Reversible stage (8 ~ 10 years old): in the primary stage of independent morality, moral judgments are made according to internal standards, and morality can be modified, neither simply obeying authority nor mechanically obeying rules, demanding equality.

(4) Justice stage (10 ~ 12 years old): The concept of justice in this stage is born out of reversible moral understanding. They tend to preside over just events.