The aim of this thesis is to challenge the tradition of theories of law to be theories of legal system. It argues that the frequently criticized individual failings of these theories are due to their common mistake in attempting to understand law in systematic forms at all. "Positivist" systems are composed of rules, norms or reasons (Hart, Harris and Raz respectively). These are linked into structured wholes by their sources. Dworkin's "Content" system links the content of "principles" into a whole which provides the "best justification" law. It is argued that from the point of view of legal actors, let al social observers, neither kind of legal system adequately encompasses describes law. Sociological theories of legal system are usually ...