Different versions of contemporary liberal theory employ different methodologies for deriving principles of justification for state action and citizenship. Theorists defend these principles as being neutral, consensual, or otherwise consistent with liberal values, if not being required by them. Some of these methodologies are neo-contractarian (Nozick,1977). Other versions are discursive or dialogic in nature; they rely upon propositions defining the particular, constrained forms of argument that might be capable of justifying assertions of power over free individuals (Ackerman, 1980). Still others are hybrid theories, employing a mix of approaches (Rawls, 1971).