... a Swiss biologist who devoted his life to studying children; in particular he studied their cognitive development. Piaget believed that the way children think and what they think changes as they mature and gain more experience of life. He developed a 'cognitive theory of moral development' based on stages which children go through as they get older and think about moral issues, by working with children from three to twelve years of age. He spent a lot of time observing these children and watching them play certain games. He then asked them questions about the rule of these games and to find out how important rules were to the children. He also told the children stories which were very similar but ended in a different ways. For instance, story one: 'a little boy who is called John is in his room. He is called to dinner. He goes into the ...

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