Political science is the systematic academic study of government, public policy, political institutions, political processes, political behaviour, political ideas, political systems, and relationships involving political power. The American Political Science Association describes it as the study of governments, public policies, political processes, systems, and political behaviour and identifies fields including political theory, political philosophy, political ideology, political economy, policy studies, comparative politics, and international relations. Political science therefore encompasses both empirical investigation and normative inquiry.
Empirical political science asks questions about what happens, why it happens, how institutions operate, how people behave, and what effects particular arrangements produce. Normative political inquiry asks questions about what political institutions ought to do, what justice requires, when authority is legitimate, what constitutes freedom or equality, and how political power should be organised. Although political science is commonly described as a social science, its methods and traditions are diverse and include statistical analysis, comparative research, historical analysis, qualitative fieldwork, experiments, surveys, formal modelling, institutional analysis, textual interpretation, and political philosophy.
The development of political science as a modern academic discipline involved a gradual movement from classical political philosophy toward systematic empirical study while retaining strong connections with history, law, economics, sociology, and philosophy. Ancient thinkers such as Plato and Aristotle examined constitutions, citizenship, political order, justice, and forms of government, while later thinkers including Machiavelli, Hobbes, Locke, Rousseau, Tocqueville, Marx, Mill, and Weber addressed political authority, institutions, state formation, social conflict, representation, bureaucracy, and political change.
During the nineteenth and twentieth centuries, universities increasingly developed specialised political studies departments and professional associations. The behavioural revolution of the twentieth century encouraged greater attention to observable political behaviour, measurement, survey research, voting, public opinion, political parties, interest groups, and comparative data. Later approaches criticised narrow behaviouralism and restored greater attention to institutions, historical context, ideas, political economy, identity, interpretation, and normative questions. Contemporary political science therefore contains several methodological traditions rather than one universally accepted method.
Political science is divided into overlapping subfields because political phenomena operate at different levels. Comparative politics examines political institutions, regimes, parties, elections, political behaviour, state formation, and policy across countries and societies. International relations studies interactions among states and other international actors, including war, diplomacy, security, trade, international institutions, and global political economy. Political theory and political philosophy examine concepts such as justice, liberty, equality, democracy, authority, rights, obligation, and legitimacy.
Public policy examines how policy problems are defined, decisions are made, policies are implemented, and outcomes are evaluated. Political economy examines interactions between political institutions and economic systems. Public administration examines the organisation and operation of government agencies and administrative processes. Other areas examine legislatures, executives, courts, elections, parties, public opinion, political communication, bureaucracy, environmental politics, urban politics, development, conflict, and many additional specialised subjects.
Political science uses multiple methods because political questions involve different types of evidence. Quantitative researchers may analyse election results, surveys, economic indicators, legislative votes, administrative records, experiments, or large cross national datasets. Qualitative researchers may conduct interviews, participant observation, archival research, process tracing, case studies, discourse analysis, or comparative historical investigation. Formal approaches use mathematical models to examine strategic interaction, collective action, voting, bargaining, institutions, and incentives.
Experimental approaches can test causal mechanisms under controlled conditions, while natural experiments and observational designs attempt to identify causal effects using naturally occurring variation. Historical approaches reconstruct political development over long periods. No method automatically provides complete understanding. Statistical relationships can identify patterns without explaining all mechanisms, while detailed case studies can illuminate mechanisms without necessarily establishing broad generalisation. Good political science therefore requires matching research methods to the question being investigated.
Political science also examines the relationship between formal institutions and actual political behaviour. A constitution may establish a legislature, executive, judiciary, electoral system, rights, and procedures, but the practical operation of those institutions can depend on political parties, informal norms, social networks, administrative capacity, economic resources, political culture, and historical experience. Researchers consequently distinguish formal rules from informal institutions and examine how the two interact.
For example, an electoral law may specify how representatives are selected, while party organisations determine who receives nominations and campaign support. A constitution may establish judicial independence, while political appointment practices and professional norms influence how independence operates in practice. Political science therefore does not simply catalogue institutions. It seeks to explain how institutional rules shape incentives, how actors respond to those incentives, and why apparently similar institutions can produce different outcomes in different societies.
A major concern of political science is causal explanation. Describing an election outcome, institutional arrangement, protest movement, policy decision, or conflict is different from explaining why it occurred. Political scientists formulate hypotheses about relationships among variables and then examine evidence capable of supporting, weakening, or challenging those explanations. Competing explanations are particularly important because political outcomes usually have multiple causes.
An electoral result may reflect economic conditions, party organisation, candidate characteristics, campaign strategy, media coverage, political identity, institutional rules, and international events simultaneously. Causal inference therefore requires careful attention to alternative explanations, measurement, selection effects, timing, and counterfactual reasoning. Political science does not produce certainty about every political event, but systematic research can make explanations more transparent, testable, and comparable than unsupported speculation.
Political science is also concerned with normative questions, particularly where empirical institutions embody claims about justice, authority, freedom, equality, rights, or democratic legitimacy. Political theory can analyse whether a political arrangement is justified even when empirical research is required to understand how that arrangement actually works. The distinction between empirical and normative analysis is important. An empirical statement might ask whether a government is elected competitively or whether a policy reduces a measurable outcome.
A normative statement might ask whether the institution or policy is justifiable. Political science can combine these forms of inquiry, but they should not be confused. Contemporary scholarship also examines how values enter research design, concept formation, interpretation, and evaluation. This makes conceptual precision especially important when terms such as democracy, legitimacy, representation, corruption, equality, or justice have both descriptive and normative dimensions.
The practical importance of political science extends beyond universities. Political science research can inform public administration, policy analysis, electoral administration, diplomacy, journalism, international organisations, civil society, polling, campaign research, legislative analysis, and institutional reform. Its broader purpose is not to provide a single political answer but to develop systematic knowledge about how political institutions and behaviour operate.
APSA notes that political science uses both humanistic and scientific perspectives and a variety of methodological approaches to examine political processes, systems, and dynamics across countries and regions. The discipline is therefore best understood as a broad field of inquiry rather than simply the study of politicians. Its central concern is the systematic investigation of political power, institutions, collective decisions, behaviour, ideas, and relationships across societies and levels of political organisation.
