Piaget's theory of moral development posited two stages - heteronomous morality and autonomous morality. Kohlberg later expanded on this, identifying six stages across three levels of moral reasoning: preconventional, conventional, and postconventional. Both theorists studied children's responses to moral dilemmas to understand their moral understanding. However, their theories have been criticized for being too focused on moral justifications rather than judgments. Naorem Binita Devi proposes additional moral dilemmas to further study moral development from different perspectives.