Branches of government

Theories of division of state power

There are different theories about how to differentiate the functions of the state (or types of government power), so that they may be distributed among multiple structures of government (usually called branches of government, or arms). There are analytical theories that provide a conceptual lens through which to understand the separation of powers as realized in real-world governments (developed by the academic discipline of comparative government); there are also normative theories, both of political philosophy and constitutional law, meant to propose a reasoned (not conventional or arbitrary) way to separate powers. Disagreement arises between various normative theories in particular about what is the (desirable, in the case of political philosophy, or prescribed, in the case of legal studies) allocation of functions to specific governing bodies or branches of government. How to correctly or usefully delineate and define the 'state functions' is another major point of contention.