The relationship between power and knowledge is central to Foucault's work. Discipline and Punish essentially charts the reorganization of the power to punish, and the development of various bodies of knowledge (the human sciences) that reinforce and interact with that power. The modern power to punish is based on the supervision and organization of bodies in time and space, according to strict technical methods: the modern knowledge that Foucault describes is the knowledge that relates to human nature and behavior, which is measured against a norm. Foucault's point is that one cannot exist without the other. The power and techniques of punishment depend on knowledge that creates and classifies individuals, and that knowledge derives its authority from certain relationships of power and domination.