This chapter explains the development of morality as emerging from social relations. On one hand, everyone knows what morality is, but, on the other hand, any attempt to clearly define it becomes a great deal more murky. There is a difference between the fact of moral relativism—that cultures do vary in moral norms—and the issue of whether this means they should vary. One of the best-known psychologists working in the area of moral development was Lawrence Kohlberg. Morality concerns right and wrong, correct and incorrect. The development of morality is interwoven with human forms of life. If at least an aspect of the development of morality is linked to reasoning, to figuring out the right thing to do, then it is important to explain the human ability to use reasoning. Changes in moral norms may not be just arbitrary, and in many cases may be an improvement.