What is separation of powers?
Separation of powers is a structural principle of government in which legislative, executive, and judicial authority are divided among distinct, independent branches, each with its own powers and each able to check the others, intended to prevent any single branch from accumulating unchecked authority.
Last reviewed . Not yet independently reviewed.
Core tenets
- Division into distinct branches
- Governing authority is divided among a legislative branch that makes law, an executive branch that enforces it, and a judicial branch that interprets it, rather than concentrated in a single body.
- Independence of each branch
- Each branch is meant to operate with meaningful independence from the others, rather than one branch simply directing or controlling the others.
- Checks and balances as the enforcement mechanism
- Each branch holds specific powers that can check the others, such as legislative override of an executive veto or judicial review of legislative and executive action, ensuring the separation remains meaningful in practice.
How it works in practice
Separation of powers is implemented differently across systems, with presidential systems typically featuring a sharper separation between the executive and legislature than parliamentary systems, where the executive is drawn from the legislature.
- Presidential separation
- The executive is elected separately from the legislature and serves an independent term, a sharper form of separation.
- Parliamentary fusion
- The executive is drawn from and accountable to the legislature, a partial fusion of the two branches distinct from the presidential model's sharper separation.
What it is often confused with
Separation of powers is closely related to checks and balances, but the two describe different aspects of the same structure: separation of powers concerns dividing authority among distinct branches, while checks and balances concerns the specific mechanisms that let each branch constrain the others.
Criticisms and debates
Debate over separation of powers centers on whether it appropriately prevents concentrated authority or simply produces institutional gridlock.
Tyranny-prevention defense
Argues that dividing authority among independent branches is essential to prevent any single actor or institution from accumulating unchecked power, a core justification since the principle's classical origins.
Response: Critics respond that a sharp separation can also make it difficult for government to act decisively or coherently, since no single branch can accomplish significant action entirely on its own.
Gridlock critique
Contends that requiring cooperation among independent branches, especially when controlled by opposing political factions, can produce sustained legislative and policy gridlock.
Response: Defenders argue this difficulty is a deliberate feature, requiring broader consensus before significant government action, rather than a design flaw.
Historical examples
- United States Constitution, 1789
- Explicitly structures the federal government into three separate branches, a foundational and widely studied example of separation of powers.
Sources
- 1.Montesquieu. The Spirit of the Laws. 1748.
- 2.Madison, James. The Federalist No. 51. 1788.
- 3.Encyclopaedia Britannica. Separation of powers.