The Practice of Political Scientists

Historical Context & Motivation

The systematic study of politics stretches back to ancient Greece, where thinkers like Aristotle catalogued the constitutions of over 150 city-states in an effort to identify which forms of government best served the public good. Yet for most of Western history, reflections on politics remained entwined with philosophy, theology, and law rather than constituting a distinct discipline. The emergence of political science as an independent academic field occurred gradually, driven by revolutions, democratization, decolonization, and the desire to apply empirical methods—rather than pure speculation—to questions about power, authority, and governance.

This evolution raises a central question that the AP Comparative Government course seeks to answer: how do political scientists systematically compare very different political systems—democratic and authoritarian, federal and unitary, presidential and parliamentary—in order to generate reliable knowledge about how governments work, why they change, and what consequences their structures have for citizens?

Core Principles & Definitions

Political scientists who engage in comparative analysis rely on a set of foundational concepts and methodological commitments. Understanding these principles is essential for the AP exam, because free-response questions frequently ask students to identify, define, and apply the tools of comparative inquiry. The concepts below form the intellectual scaffolding of the discipline.

Visual Explanation: The Comparative Research Cycle

The diagram above illustrates the iterative nature of comparative political inquiry. A political scientist begins with a research question—for instance, "Why do some countries with similar colonial histories develop democracies while others become authoritarian?" Next, the scholar formulates a testable hypothesis, such as "Countries that inherited common-law legal systems were more likely to democratize." The third stage involves case selection—choosing which countries to compare, often using a most-similar-systems or most-different-systems design. Data collection and analysis follow, employing quantitative statistics, qualitative process-tracing, or a mixed-methods approach. Finally, the conclusions either support, refine, or reject the hypothesis, generating new questions and feeding back into the cycle.

How Political Scientists Compare: Methods in Depth

Most Similar Systems Design (MSSD)

In a most similar systems design, the researcher selects countries that share many background characteristics but differ on the outcome of interest. By holding shared traits constant, the scholar isolates the variable that explains the divergent outcome. For example, comparing the United Kingdom and Nigeria—both former British colonies with common-law traditions—might help reveal why one consolidated democracy while the other experienced prolonged military rule. The key independent variable that differs between the two cases becomes the probable explanation.

Most Different Systems Design (MDSD)

The most different systems design takes the opposite approach: cases are selected precisely because they differ on many dimensions yet share the same outcome. If countries as varied as Iran, China, and Russia all exhibit durable authoritarianism despite enormous differences in culture, geography, and history, a common factor they share—such as control of oil rents or a dominant single-party apparatus—may be the causal driver. This design is powerful for theory generation but can be complicated by the sheer number of differing variables.

Quantitative vs. Qualitative Approaches

Political scientists frequently debate the relative merits of quantitative (large-N statistical) and qualitative (small-N case study) methods. Quantitative studies can detect patterns across many countries—for example, correlating GDP per capita with regime type in 150 states—but may miss the specific causal mechanisms at work. Qualitative research, including process-tracing and in-depth interviews, can uncover causal chains within a single country but may not generalize. The contemporary consensus favors mixed-methods designs that combine breadth with depth.

Essential Concepts for Comparative Analysis

The AP Comparative Government course centers on six core countries—the United Kingdom, Russia, China, Iran, Mexico, and Nigeria—and expects students to deploy a common set of analytical concepts when comparing them. Political scientists use these concepts as a shared vocabulary, ensuring that comparisons are systematic rather than ad hoc.

Worked Example: Applying the Comparative Method

Suppose an AP exam free-response question asks: "Using the comparative method, explain why Mexico has undergone gradual democratization while China has maintained single-party authoritarian rule." Below is a step-by-step model response.

Strengths & Limitations of Comparative Methods

Connecting to Advanced Theoretical Frameworks

The practice of political scientists does not occur in a theoretical vacuum. Comparative scholars draw on several major paradigms—each offering a different lens through which to interpret political systems, regimes, and governments. Understanding these frameworks helps students move from description to explanation, which is precisely what AP free-response questions demand.

As students advance in political science, they will encounter increasingly sophisticated debates among these paradigms—for instance, whether institutions cause development or development creates institutions. At the AP level, the key skill is the ability to apply a theoretical framework to specific country evidence and to recognize that no single theory fully explains the complex reality of any political system.

Practice Problems

Lesson Summary