Full context:   Lawrence Kohlberg has led most of the studies based on moral development in adults. In Kohlberg's studies, the subjects are ranked accordingly at one of the six stages. Stage 1 is called the Obedience and Punishment Orientation. Stage 1 is preconventional morality because the subject sees morality in an egocentric way. Stage 2 is also considered to be preconventional morality and is labeled as Individualism and Exchange. At this stage, the individual is still concentrated on the self and his surrounding environment. Stages 3 and 4 are at level 2, Conventional Morality. Stage 3 is called Interpersonal Relationships and is the point where the individual realizes that people should behave in good ways not only for the benefit of themselves but the family and community as well. Stage 4, Maintaining the Social Order, the individual is more concentrated on society as a whole. Stage 5 and 6 are both at level 3, post-conventional Morality. Stage 5 is the social contract and Individual Rights. At this stage people are contemplating what makes a good society rather than just what makes a society run smoothly. Stage 6, Universal Principles is the last stage which interprets the foundation of justice [full citation needed] Kohlberg completed a 20-year study and found that most 30-year-old adults were at stage 3 and 4, the conventional level. According to this study there is still room for moral development in adulthood.