English:Elections and Electoral Systems
Elections and Electoral Systems
Introduction
Elections are one way in which people choose representatives, governments, or public officials. An electoral system is the set of rules that turns votes into political offices or seats. These rules matter because the same pattern of voter preferences can produce different outcomes under different systems. In this aiMOOC for Grades 9–10, you will compare major electoral systems, examine how elections are administered, test simple vote-to-seat examples, and evaluate trade-offs such as proportionality, local representation, simplicity, accountability, and inclusion.
You should not expect one electoral system to be best for every society. Electoral systems are institutional choices. Their effects depend on details such as district size, ballot design, thresholds, party competition, political geography, and the wider legal and social environment. Your goal is to understand the rules well enough to explain their likely effects and to justify comparisons with evidence.
Media focus: The photograph below shows a voter placing a ballot into a ballot box. Think about the procedures that make the act meaningful: eligibility rules, a secret ballot, accurate counting, and trustworthy administration.
The Crash Course video introduces election basics using the United States as its main example. While watching, separate general ideas about elections from rules that apply only to one country.
Learning Goals
By the end of this course, you should be able to explain the difference between an election and an electoral system; distinguish plurality, majority, proportional, ranked, and mixed systems; compare how votes become seats; describe key stages of an election; evaluate strengths and trade-offs without assuming that one system is always superior; explain why district boundaries and electoral integrity matter; and apply your knowledge to unfamiliar election scenarios.
Key Vocabulary
| Term | Meaning |
|---|---|
| Election | A formal process in which eligible voters choose among candidates, parties, or options. |
| Electoral system | The rules that determine how votes are cast, counted, and translated into winners or seats. |
| Constituency | A geographic electoral district represented by one or more elected members. |
| Plurality | A rule under which the option with more votes than any other option wins, even without more than half of all votes. |
| Majority | More than half of the relevant votes. |
| Proportional representation | A family of systems designed so that parties or groups receive seat shares that broadly reflect vote shares. |
| Ranked ballot | A ballot on which voters place candidates in order of preference. |
| District magnitude | The number of representatives elected from one electoral district. |
| Electoral threshold | A minimum level of support a party or candidate must reach to qualify for seat allocation under specified rules. |
| Turnout | The share of eligible or registered voters, depending on the measure used, who cast a ballot. |
How Elections Work
A democratic election is more than one day of voting. It is an electoral cycle involving rules, institutions, candidates, voters, information, voting procedures, counting, and ways to resolve disputes. International election standards and observation practice therefore examine the whole process rather than only the moment when a ballot is cast.
| Stage | Main questions |
|---|---|
| Legal framework | Who may vote and stand for office? Which offices are elected? Which electoral formula is used? |
| Registration and nomination | How are eligible voters registered? How do candidates and parties qualify for the ballot? |
| Campaign and information | Can competitors communicate freely? Can voters obtain reliable information and compare choices? |
| Voting | Can eligible voters cast a secret ballot safely, independently, and accessibly? |
| Counting and tabulation | Are ballots counted according to clear rules, with transparent procedures and safeguards? |
| Certification and disputes | How are official results declared, challenged, audited, recounted, or reviewed when necessary? |
A voting booth protects the secrecy of the ballot, which helps voters make choices without another person seeing how they voted.
Elections, Democracy, and Representation
Elections can support representative democracy when voters have genuine choices and the process protects political rights. However, holding an election by itself does not guarantee a democratic system. Important conditions include broad and equal voting rights, genuine competition, freedom of expression and association, access to information, impartial administration, ballot secrecy, transparent counting, and meaningful legal remedies.
Representation can also mean different things. Geographic representation connects a representative to a local district. Proportional representation focuses on matching seat shares more closely to vote shares. Descriptive representation asks whether elected bodies include people from different social groups. Substantive representation asks whether representatives act on the interests and policy concerns of constituents. Electoral design can influence these forms of representation, but it does not determine them by itself.
Families of Electoral Systems
International IDEA commonly distinguishes major electoral-system families including plurality or majority systems, proportional representation systems, and mixed systems. Other systems also exist. The map below gives a global overview, but electoral laws can change, so use maps as a starting point and verify current rules when studying a specific country.
First-Past-the-Post and Plurality Rules
In first-past-the-post, usually used in single-member districts, the candidate with the most votes wins. The winner does not need more than 50 percent. For example, if Candidate A receives 42 percent, Candidate B 35 percent, and Candidate C 23 percent, Candidate A wins because 42 percent is the largest share.
FPTP is easy to count and creates a direct link between a district and one representative. At the same time, national seat totals can differ sharply from national vote shares because the system rewards winning individual districts, not accumulating votes nationwide. Votes for losing candidates and votes beyond what a winner needed do not directly add to representation in that district.
Media literacy note: This CGP Grey video argues critically against first-past-the-post. Treat it as an explanatory argument, not as a neutral verdict. Identify the examples it uses, the assumptions behind them, and any advantages or counterarguments you would add.
Majority and Two-Round Systems
A majority system aims to ensure that the winner reaches a required level of support, often more than half of valid votes. In a common two-round system, voters cast ballots in a first round. If no candidate satisfies the winning rule, a second round is held under rules set by law. In some presidential elections, only the top two candidates advance; other elections can use different qualification rules.
A runoff can give voters a second opportunity to choose among a smaller set of candidates. It can also increase election costs and require voters to return for another round. The exact political effects depend on candidate competition, turnout, and the rules for advancing to round two.
Ranked-Choice and Instant-Runoff Voting
In instant-runoff voting, also called the alternative vote in some countries, voters rank candidates in a single-seat contest. First preferences are counted. If no candidate has the required majority, the lowest-ranked candidate is eliminated and those ballots transfer to each voter's next available preference. The process continues until a candidate wins under the rule.
Ranked ballots let voters express more than one preference. They can reduce the need for a separate runoff election. However, the count is more complex than a simple plurality count, and some ballots can become inactive if all ranked candidates have been eliminated.
Proportional Representation
Proportional representation aims to make the distribution of seats broadly reflect the distribution of votes. PR normally uses multi-member districts or a nationwide allocation. Two major forms are party-list proportional representation and the single transferable vote.
In party-list PR, parties present lists of candidates. Voters may choose a party, candidates within a party, or both, depending on whether the list is closed, open, or flexible. Seats are then allocated using a mathematical rule. Systems such as D'Hondt and Sainte-Laguë are examples of seat-allocation methods. The exact result depends on the formula, district magnitude, thresholds, and list rules.
A simple illustration: if a ten-seat district has two parties receiving about 60 percent and 40 percent of the vote, a proportional allocation might be close to six seats and four seats. Real systems can produce different results because of rounding, thresholds, more parties, and the specific allocation formula.
Single Transferable Vote
The single transferable vote combines ranked ballots with multi-member districts. Voters rank individual candidates. A quota is calculated. Candidates who reach the quota are elected, surplus votes can transfer according to later preferences, and lower candidates can be eliminated with their ballots transferred. The process continues until all seats are filled.
STV gives voters influence over individual candidates while seeking proportional outcomes within multi-seat districts. The count is more complex than FPTP, and the degree of proportionality depends partly on district magnitude.
The photograph shows a count during Ireland's 2011 election. Ireland uses PR-STV for elections to Dáil Éireann, making it a useful case for studying ranked ballots, quotas, transfers, and multi-seat constituencies.
Mixed Electoral Systems
Mixed systems combine elements of plurality or majority rules with proportional representation. They are not all the same.
In mixed-member proportional representation, or MMP, local or constituency seats are combined with list seats, and the list allocation compensates for disproportionality created by the constituency results. In a parallel system, the two parts are calculated separately, so the proportional tier does not compensate for disproportionality in the district tier.
New Zealand provides a clear MMP example. Voters have a party vote and an electorate vote. The party vote largely determines each qualifying party's overall share of seats, while electorate votes choose local representatives.
The CGP Grey video uses a simplified fictional example to explain MMP. Compare its explanation with the official Elections New Zealand description in the source section below.
Design Features That Change Outcomes
The system family is only the beginning. Small-looking design choices can strongly affect results.
District Magnitude
District magnitude is the number of representatives elected from one district. FPTP normally has magnitude one. PR systems use multi-member districts. Other factors being equal, larger district magnitudes often allow seat shares to track vote shares more closely because more seats are available to distribute. Smaller magnitudes can strengthen local links but can also make representation less proportional.
Electoral Thresholds
An electoral threshold is the minimum support required to participate in seat allocation under a particular rule. Thresholds can be written into law or arise naturally from district size and the allocation method. A higher threshold can reduce the number of very small parties represented, but it can also exclude more votes from producing seats. A lower threshold can increase inclusion while potentially increasing party fragmentation.
Ballot Structure and Voter Choice
A ballot can ask you to choose one candidate, choose one party, rank candidates, or make more than one decision. In a closed-list PR system, the party controls candidate order. In an open-list system, voters have more influence over which candidates from a party are elected. MMP often gives separate constituency and party votes. Ballot structure therefore affects both voter choice and candidate incentives.
Strategic Voting
Strategic voting occurs when a voter chooses an option partly because of the likely consequences under the electoral rules rather than simply selecting their first preference. For example, a voter in a plurality contest may support a second-choice candidate whom they believe has a better chance of defeating a less-preferred candidate. Ranked and proportional systems create different strategic possibilities. Strategic behavior is an incentive created by rules and expectations, not proof that voters are acting dishonestly.
District Boundaries and Gerrymandering
When representatives are elected from geographic districts, boundary design matters. Districts should follow legal criteria such as population equality, continuity, communities of interest, or administrative boundaries, depending on the country.
Gerrymandering means manipulating electoral boundaries to advantage a political party, candidate, or group. Two common techniques are often described as packing, concentrating opponents in a small number of districts, and cracking, splitting opponents across several districts so they are less likely to win.
The diagram uses equal numbers of two colored groups but shows how different boundary lines can produce different seat outcomes. This demonstrates why seat results in district-based systems depend on both voter preferences and political geography.
A related issue is malapportionment, in which districts contain very unequal numbers of people or voters, causing votes to have unequal representational weight. Independent boundary commissions, transparent criteria, public consultation, and judicial review are among the safeguards used in different democracies.
Electoral Integrity, Access, and Trust
Election integrity depends on procedures that allow eligible voters to participate and that produce results reflecting the lawful ballots cast. Useful safeguards can include accurate voter registers, clear ballot design, trained poll workers, secure handling of ballots, transparent counting, observers, audits, recount rules, accessible polling arrangements, and independent methods for resolving disputes.
Accessibility matters because a right is not meaningful if eligible voters cannot use it in practice. Election authorities may need to address physical access, language access, voting assistance, remote voting rules, registration barriers, and reliable voter information. The exact solutions differ by jurisdiction.
Trust should be based on evidence and verifiable procedures rather than on slogans. When evaluating a claim about an election, ask what the rule is, which institution is responsible, what evidence is available, whether procedures were observed or audited, and what legal process exists for challenges.
Comparative Case Studies
Comparing real systems helps you see how different rules pursue different goals.
| Country and office | Core system | What to notice |
|---|---|---|
| United Kingdom House of Commons | First-past-the-post | One MP is elected from each constituency; the candidate with the most votes wins. |
| New Zealand House of Representatives | Mixed-member proportional | Voters have a party vote and an electorate vote; the party vote largely determines proportional seat shares for qualifying parties. |
| Ireland Dáil Éireann | Proportional representation by single transferable vote | Voters rank candidates in multi-seat constituencies; quotas and transfers help fill the seats. |
| France presidency | Two-round majority system | A second round can be held when no candidate satisfies the first-round winning requirement. |
| United States presidency | Electoral College | State-based electoral votes, not one direct national popular-vote total, determine the winner under constitutional and state rules. |
The Electoral College map shows the allocation and outcome of electoral votes in the 2024 United States presidential election. It is a reminder that elections may combine popular voting with an indirect constitutional mechanism.
A Seat-Vote Thought Experiment
Imagine ten equal-sized single-member districts. In every district, Party Green receives 60 percent of the vote and Party Purple receives 40 percent. Under FPTP, Green would win all ten seats because it leads in every district. Across all voters, however, the vote split is 60 to 40. Under a ten-seat proportional system with no other parties and a straightforward proportional allocation, the result could be about six seats to Green and four to Purple.
This example is deliberately simple. Real elections have different district populations, turnout levels, multiple parties, geographic patterns, thresholds, formulas, and independent candidates. The point is not that one result is automatically fair and the other unfair. The point is that electoral rules translate the same votes in different ways.
Evaluating Electoral Systems
A useful comparison does not ask only, "Which system is best?" Instead, choose clear criteria and identify trade-offs.
| Criterion | Questions to ask |
|---|---|
| Proportionality | How closely do seat shares reflect vote shares? |
| Local representation | Can voters identify a representative responsible for their area? |
| Voter choice | Can voters choose among parties, candidates, or rankings? |
| Simplicity | How easy is it to vote correctly and understand the count? |
| Accountability | Can voters identify whom to reward or remove from office? |
| Inclusion | How likely are smaller political groups to gain representation? |
| Governability | How do the rules influence coalition building, single-party government, or fragmentation? |
| Resistance to manipulation | How vulnerable are outcomes to boundary design, strategic nomination, or other rule-based advantages? |
Political scientists often study relationships between electoral systems and party systems. Plurality rules in single-member districts can create incentives for competition among fewer large parties, while proportional rules can make representation easier for smaller parties. These are tendencies, not mechanical laws. Social divisions, history, institutions, regional parties, campaign strategy, and voter behavior also matter.
Media and Information During Elections
Campaign information reaches voters through television, newspapers, debates, advertising, social media, candidate websites, and conversations. You should evaluate election information using the same source-literacy habits you use in other subjects.
Check who created a claim, what evidence is offered, whether statistics have a clear denominator and time period, whether an image or video has been taken out of context, and whether a source distinguishes reported facts from opinion. For procedural questions, prefer the official election authority or the text of the relevant law. For comparative analysis, use reputable research organizations and multiple sources.
Sources and Further Reading
- International IDEA Electoral System Design Database: Comparative definitions and data on electoral-system families and rules.
- ACE Electoral Knowledge Network: Electoral Systems: An extensive English-language resource on electoral-system design, consequences, and case studies.
- UK Electoral Commission: How MPs are elected: An official explanation of first-past-the-post for the UK House of Commons.
- Elections New Zealand: What is MMP?: An official explanation of New Zealand's mixed-member proportional system.
- Ireland Electoral Commission: Ireland's voting system: An official explanation of PR-STV, preferences, quotas, and transfers.
- OSCE ODIHR election handbooks: Resources on election administration, observation, participation, campaigns, and technology.
- Wikimedia Commons: Source repository for the freely licensed or public-domain images embedded in this course.
Interactive Tasks
Quiz: Test Your Knowledge
What is an electoral system? (A set of rules that converts votes into political offices or seats) (!A list of campaign promises made by one party) (!A schedule showing only the date of an election) (!A law requiring every voter to support the winner)
What happens under first-past-the-post in a single-member district? (The candidate with more votes than any other candidate wins) (!The candidate must always receive more than two thirds of the votes) (!Seats are divided among all parties in proportion to national vote share) (!The lowest candidate automatically advances to a second round)
Which feature is most closely associated with proportional representation? (Seat shares are designed to broadly reflect vote shares) (!Every district must elect exactly one representative) (!The national winner must receive every seat) (!Voters are never allowed to choose political parties)
What does district magnitude describe? (The number of representatives elected from one district) (!The physical size of a ballot box) (!The number of campaign days before voting) (!The percentage of voters who register online)
What is the main difference between MMP and a parallel mixed system? (MMP uses the proportional tier to compensate for district disproportionality) (!MMP never includes constituency representatives) (!Parallel systems require voters to rank every candidate) (!Parallel systems always use only one national district)
What is gerrymandering? (Manipulating electoral district boundaries to advantage a political group) (!Counting ballots more than once during an official recount) (!Allowing voters to rank candidates by preference) (!Dividing seats proportionally among parties)
Why is a secret ballot important? (It helps voters make choices without others seeing how they voted) (!It prevents any official result from being published) (!It allows only political parties to examine ballots) (!It removes the need for voter eligibility rules)
How does instant-runoff voting use voter preferences? (It transfers ballots according to later rankings when candidates are eliminated) (!It gives every candidate the same number of first preferences) (!It counts only the final candidate named on each ballot) (!It converts every election into a nationwide party-list contest)
What is an electoral threshold? (A minimum level of support required to qualify for seat allocation under specified rules) (!A maximum number of voters allowed inside a polling station) (!A rule that every winner must be an independent candidate) (!A boundary separating two campaign headquarters)
Which statement best supports a careful comparison of electoral systems? (Different systems create trade-offs that should be judged using clear criteria) (!One electoral system is automatically best for every country) (!Election outcomes depend only on campaign advertising) (!District boundaries never affect representation)
Memory Game
| Plurality | More votes than any other option |
| Majority | More than half of the relevant votes |
| Constituency | Geographic area represented by elected members |
| Threshold | Minimum support required under a seat-allocation rule |
| Turnout | Share of eligible or registered voters who cast a ballot |
| Gerrymandering | Manipulation of district boundaries for political advantage |
| Ranking | Ordering candidates by preference |
| Proportionality | Closeness between vote shares and seat shares |
Drag and Drop
| Match the correct terms. | Topic |
|---|---|
| First-past-the-post | Highest vote total wins a single-member district |
| Party-list PR | Seats are allocated to parties broadly according to vote share |
| Instant-runoff voting | Ranked preferences transfer after eliminations |
| Mixed-member proportional | Constituency seats are combined with compensating list seats |
| Gerrymandering | District boundaries are manipulated for political advantage |
...
Crossword Puzzle
| Plurality | What term means having more votes than any other option without necessarily having more than half? |
| District | What is a geographic area used to elect one or more representatives? |
| Threshold | What is the minimum support sometimes required before a party can receive seats? |
| Turnout | What word describes the share of eligible or registered voters who cast ballots? |
| Ballot | What is the paper or other voting instrument used to record a voter's choice? |
| Gerrymander | What verb means to manipulate electoral boundaries for political advantage? |
LearningApps
Cloze Text
Open-Ended Tasks
Easy
- Election Vocabulary Poster: Create a one-page visual poster explaining six key terms from this course in your own words and add one example for each term.
- Ballot Design: Design a clear mock ballot for a fictional school election and write a short explanation of how your layout protects voter understanding and ballot secrecy.
- Local Representation Interview: Interview a classmate or family member about what they expect from an elected representative and summarize the two most important expectations you heard.
- Media Source Check: Choose one election-related social media post, identify its source and evidence, and write three questions you would ask before trusting it.
Standard
- Mock Election Comparison: Run the same fictional class vote once with first-past-the-post and once with a proportional seat rule, then compare how the outcomes differ.
- Electoral System Infographic: Produce an infographic comparing first-past-the-post, party-list proportional representation, and instant-runoff voting using the same five criteria.
- Country Election Profile: Research the current electoral system of one democratic country using an official election authority and one comparative source, then present the rules in a two-minute video or short report.
- Gerrymandering Investigation: Draw two different district maps over the same fictional voter distribution and explain how boundary choices can change the number of seats won.
Advanced
- Seat Allocation Experiment: Create a spreadsheet or table showing how at least three different vote distributions would translate into seats under a plurality system and a proportional system, then explain the patterns you observe.
- Electoral Reform Debate: Prepare and record a balanced debate in which one side argues for changing a fictional country's electoral system and the other side defends the current rules using agreed evaluation criteria.
- Election Integrity Audit: Design a checklist for observing a mock election from registration through counting and disputes, then apply it to a classroom election and write an evidence-based evaluation.
- Comparative Electoral Systems Documentary: Produce a three-to-five-minute video comparing two real countries with different electoral systems and explain how institutional rules influence representation without claiming that rules alone determine political outcomes.
Learning Assessment
- Rule-to-Outcome Analysis: Given one set of fictional votes, calculate or reason through the winners under two different electoral systems and explain why the results differ.
- Criteria-Based Evaluation: Compare two electoral systems using proportionality, local representation, voter choice, simplicity, accountability, and inclusion, then justify which system better fits a specified fictional society.
- Boundary Fairness Case: Analyze a district map and voter distribution, identify possible packing or cracking, and propose a more defensible boundary approach using stated criteria.
- Evidence Evaluation: Assess three claims about an election by distinguishing procedural facts, opinion, and unsupported inference, and identify which sources would be needed to verify each claim.
- Institutional Transfer Task: Design an electoral system for a fictional student council or local assembly and explain how district magnitude, ballot structure, and thresholds would shape representation.
- Comparative Case Explanation: Explain why the United Kingdom, New Zealand, Ireland, France, and the United States can produce different patterns of representation even when all use elections to choose political leaders or representatives.
Evidence of Learning
Knowledge: You can accurately define major electoral-system families, distinguish plurality from majority rules, explain proportional representation, describe ranked and mixed systems, and identify important design features such as district magnitude and thresholds.
Skills: You can interpret vote totals, compare seat outcomes, read simple electoral maps and diagrams, evaluate source reliability, distinguish neutral explanation from advocacy, and apply common evaluation criteria to institutional choices.
Products: Strong evidence may include a mock ballot, infographic, district map, comparative report, spreadsheet, interview summary, debate recording, election-observation checklist, or short documentary created in the open-ended tasks.
Reasoning: You can explain causal links carefully, for example why single-member districts can produce disproportional seat totals, why larger district magnitude can affect proportionality, or why compensating list seats make MMP different from a parallel mixed system.
Transfer: You can use the concepts from this course to analyze a new country, a school election, a local council election, or a proposed reform without assuming that the same institutional design fits every context.
OERs on the Topic
The English Wikipedia article on electoral systems provides a broad overview and links to more specialized topics. You can also explore Election, Voting, Representative democracy, First-past-the-post voting, Proportional representation, Single transferable vote, Instant-runoff voting, Mixed-member proportional representation, and Gerrymandering.
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