comparison

Comparison is the foundational analytical operation in the social sciences, history, and public administration, denoting the systematic juxtaposition of two or more units — states, constitutions, institutions, policies, or historical epochs — to isolate similarities, differences, and the variables that explain them. In comparative politics, the method was formalised through the work of Aristotle, whose Politics classified 158 Greek constitutions, and modernised by scholars such as Gabriel Almond, Sidney Verba (The Civic Culture, 1963), and Arend Lijphart, who distinguished the "most similar systems" design (varying the outcome while holding context constant) from the "most different systems" design. John Stuart Mill's A System of Logic (1843) supplied the underlying logic through his Method of Agreement and Method of Difference, which remain the canonical templates for comparative causal inference.

In practice, comparison operates by defining a clear unit of analysis, specifying variables to be held constant and those allowed to vary, and selecting cases to maximise analytical leverage. The small-N comparison favoured in Charles Ragin's qualitative comparative analysis trades statistical generalisability for contextual depth, while large-N cross-national studies pursue probabilistic generalisations. Key hazards include Giovanni Sartori's warning against "conceptual stretching" — applying a category beyond the contexts where it retains meaning — and Galton's Problem, the risk that apparent correlations across cases reflect diffusion rather than independent causation. Good comparison demands that the units be genuinely commensurable, that concepts travel without distortion, and that selection bias from choosing cases on the dependent variable be avoided.

The method pervades exam-relevant subject matter. Federalism is taught comparatively — contrasting the strong-centre Indian model under the Seventh Schedule with the dual federalism of the United States or the cooperative federalism of Germany's Basic Law. Constitutional studies juxtapose the parliamentary Westminster system with the American presidential separation of powers, or compare judicial review under Marbury v. Madison (1803) with the basic-structure doctrine of Kesavananda Bharati (1973). World history is structured through comparison of revolutions — the French (1789), Russian (1917), and Chinese (1949) — and through Barrington Moore's comparative thesis on the divergent paths to modernity in Social Origins of Dictatorship and Democracy (1966). Global-institutions papers compare the League of Nations with the United Nations, or the veto structures of the Security Council with the consensus norms of the World Trade Organization.

For the examination, comparison is less a discrete topic than a transferable skill rewarded across papers. UPSC General Studies II and the Political Science optional, the FSOT, and the CSS and BCS political science and current-affairs papers routinely set "compare and contrast" or "examine the differences between" questions that demand a structured matrix rather than two separate descriptions. High-scoring answers state the basis of comparison explicitly, organise the response thematically rather than case-by-case, deploy named authorities and dated instances on both sides, and conclude with an analytical judgement. Candidates should internalise Mill's methods and Sartori's caution as the intellectual scaffolding that distinguishes a rigorous comparison from a mere list.