Idea
State functions are divided among a legislature, an executive and courts, and each institution is meant to limit the others. The aim is to prevent concentration of power and arbitrary rule.
Theory
Montesquieu's De l'esprit des lois (1748) argued that liberty is endangered when legislative and executive power are joined. M. J. C. Vile distinguished a "pure doctrine" of strict separation from the later idea of checks and balances. In The Federalist No. 47 and 51, Madison defended overlapping powers rather than complete separation.
Real examples
- United States: Articles I, II and III of the 1787 Constitution create Congress, the President and the federal courts, with separate election and tenure.
- Germany: Article 20(2) of the Basic Law has state authority exercised through "specific legislative, executive and judicial bodies".
- Parliamentary systems, such as the United Kingdom, fuse legislature and executive; Bagehot called this fusion the "efficient secret" of the English constitution.
Critique
Juan Linz argued that separately elected presidents and legislatures can produce deadlock and democratic breakdown, while others dispute this. Modern states also have bodies, such as regulators, central banks and audit offices, that do not fit the three-branch scheme.
Results
Some form of separation is nearly universal in constitutional states; its precise design and its effect on stability and policy remain debated.
Claims
Montesquieu's De l'esprit des lois (1748) argued that liberty is endangered when legislative and executive power are united. In The Federalist Nos. 47 and 51 Madison adapted the idea to the US Constitution as a system of partly overlapping powers that check one another rather than complete separation.[1][2][3][4][5]
Juan Linz (1990) argued that presidential systems with separately elected executives and legislatures are more prone to deadlock and democratic breakdown than parliamentary ones; later comparative work disputes this and attributes breakdowns to other factors.[1][2][3]
Article 20(2) of Germany's Basic Law provides that state authority is exercised by the people through elections and other votes and through specific legislative, executive and judicial bodies.[1]
Revision history
- 2026-10-23rev 1 — Seed import