This document summarizes Kohlberg's theory of moral development. It explains that Kohlberg identified six stages of moral reasoning ability that individuals progress through over their lifetime. These stages include pre-conventional (obedience to rules to avoid punishment), conventional (conforming to social norms), and post-conventional (guiding by universal ethical principles). The document uses Kohlberg's example of the Heinz dilemma to illustrate how individuals at different stages would reason about whether a man should steal a drug to save his wife. It concludes with some criticisms of Kohlberg's theory, such as whether moral reasoning truly leads to moral behavior.