Learn more about kohlberg's stages of moral development in the Boundless open textbook. Kolhberg's theory of moral development states that we progress. KOHLBERG'S STAGES OF MORAL DEVELOPMENT. Lawrence Kohlberg was a moral philosopher and student of child development. He was director of. KOHLBERG'S MORAL STAGES. Kolberg's theory specifies six stages of moral development, arranged in three levels. Level I: Preconventional /Premoral. Moral.