Party & Electoral Systems
What this unit covers
The topics below follow the published Comp Gov course framework for Unit 4. This unit is worth 13–18% of the exam, so budget your time against that rather than against how long the unit takes to teach.
Lessons in this unit
- Electoral Systems15 min · 3 objectivesDistinguish first-past-the-post, proportional representation, and mixed systems · Explain how electoral rules shape the number of parties · Identify the electoral systems used across the core countries
- Party Systems14 min · 3 objectivesDistinguish one-party, dominant-party, two-party, and multiparty systems · Classify the party systems of the core countries · Explain how party systems relate to electoral rules and regime type
- Voting Behavior & Interest Groups13 min · 3 objectivesIdentify factors that shape voting behavior and turnout across the core countries · Distinguish pluralist and corporatist interest-group systems · Analyze how interest groups gain influence under different regimes
What examiners penalize here
- Memorize the pairing: **FPTP → two parties** (UK), **PR → many parties + coalitions**, **mixed → in between** (Mexico, Russia). When a prompt changes the electoral rules, predict the party-system effect through Duverger’s law for full credit.
- Distinguish **one-party** (rivals banned — China) from **dominant-party** (rivals legal but never win — Russia, historic PRI Mexico). The presence of *legal but powerless* opposition is the giveaway for a dominant-party system.
- Contrast the two interest-group models cleanly: **pluralism** = many groups, open competition, no guaranteed access (UK); **corporatism** = few recognized groups with privileged access, and in its **state** form the government controls them (China). Name the model *and* the country.
Practice Comp Gov
Our practice bank is drawn from across the whole course rather than filtered to one unit, which is closer to how the exam asks anyway — it will not tell you which unit a question is testing.
Questions about this unit
How much of the AP Comparative Government & Politics exam is Unit 4?
Unit 4, Party & Electoral Systems, is worth 13–18% of the Comp Gov multiple-choice section according to the published course framework. Across all 5 units that makes it a substantial share — heavier than an even split would give it.
What topics are covered in Comp Gov Unit 4?
Party & Electoral Systems covers Elections, Party systems, Voting and Interest groups.
How should I study Comp Gov Unit 4?
Read the 3 lessons below first — about 40 minutes — then work practice questions on these topics. Finish with practice questions and read the explanation for every one you get right by elimination as well as the ones you miss.
All 5 units of AP Comparative Government & Politics
Unit names, topics and exam weights follow the published College Board course framework for AP Comparative Government & Politics. AP® is a trademark registered by the College Board, which does not endorse this site.