How do the main voting systems used in Scotland and the UK work, and what are their advantages and disadvantages?
Voting systems: how First Past the Post, the Additional Member System and the Single Transferable Vote work, where each is used, and their strengths and weaknesses.
How the main UK voting systems work for SQA National 5 Modern Studies: First Past the Post for the UK Parliament, the Additional Member System for the Scottish Parliament and the Single Transferable Vote for Scottish councils, with the advantages and disadvantages of each and worked exam answers.
Reviewed by: AI editorial process; not yet individually human-reviewed
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What this dot point is asking
This dot point sits in Section 1 of the SQA National 5 Modern Studies question paper, Democracy in Scotland and the United Kingdom. It asks you to understand the three main voting systems used in Scotland and the UK: First Past the Post (FPTP), the Additional Member System (AMS) and the Single Transferable Vote (STV). You need to know how each works, where it is used, and its advantages and disadvantages.
This is one of the most popular exam topics because it links to elections, representation and how governments are formed. Describe questions ask for features of a system; explain questions ask for the advantages and disadvantages.
The answer
First Past the Post (FPTP) - UK Parliament
FPTP is used to elect MPs to the UK Parliament at Westminster. The UK is divided into constituencies, each electing one MP. Voters mark a single X for one candidate, and the candidate with the most votes in each constituency wins, even without an overall majority. This is a majoritarian (not proportional) system.
- Advantages: simple to understand and count; usually produces a single-party majority government that can govern decisively; gives each area one clear local MP.
- Disadvantages: not proportional, so seats won do not match votes cast; a party can win power with well under half the votes; smaller parties with support spread across the country win few seats; many votes are "wasted" in safe seats.
The Additional Member System (AMS) - Scottish Parliament
AMS elects the 129 MSPs to the Scottish Parliament. It is a mixed system combining FPTP with a proportional top-up.
Voters have two votes: one for a constituency MSP (73 seats, elected by FPTP) and one for a regional party list (56 seats across eight regions).
The regional list seats are used to top up parties so the overall result is more proportional, correcting the distortion of the constituency vote.
Advantages: more proportional than FPTP, so seats better reflect votes; voters get both a local representative and a more proportional outcome; smaller parties have a fairer chance through the list.
Disadvantages: more complicated with two votes and two types of MSP; it often produces coalition or minority governments, which can mean slower decision-making; list MSPs have no single constituency, which some see as less accountable.
The Single Transferable Vote (STV) - Scottish local councils
STV elects councillors to Scottish local councils. Each ward elects several councillors (usually three or four).
Voters rank candidates in order of preference (1, 2, 3 and so on).
A candidate needs to reach a quota to be elected. Surplus votes above the quota, and votes of eliminated candidates, are transferred to next preferences until all seats are filled.
Advantages: highly proportional, so councils reflect the range of opinion; voters can rank candidates and few votes are wasted; multi-member wards give voters a choice of councillor to approach.
Disadvantages: complex to understand and count; can produce no overall control, leading to coalitions; the link between a voter and a single representative is weaker.
How the systems compare
The core trade-off runs through all three. FPTP favours strong, single-party government but is unfair to smaller parties. AMS and STV are fairer and more proportional but tend to produce coalitions or minority governments, which need compromise and can be slower. An explain question usually wants you to weigh this trade-off rather than just list features.
Examples in context
If a source describes a party winning a UK general election with a large majority of seats on around 40% of the vote, that illustrates how FPTP is not proportional. If a source describes Scottish voters casting two votes and a smaller party gaining seats from the regional list, that is AMS. If a source describes council voters ranking candidates 1, 2, 3, that is STV. Linking the example to the system is the skill.
Try this
Q1. Which voting system is used for each of the UK Parliament, the Scottish Parliament and Scottish councils? [3 marks]
- What the marker wants. UK Parliament: FPTP; Scottish Parliament: AMS; Scottish councils: STV.
Q2. State one advantage and one disadvantage of First Past the Post. [2 marks]
- What the marker wants. Advantage: simple and usually gives a majority government. Disadvantage: not proportional, unfair to smaller parties.
Q3. Explain why AMS is described as more proportional than FPTP. [3 marks]
- What the marker wants. The regional list seats top up parties whose constituency results did not match their vote share, so the overall number of MSPs better reflects how people voted.
A note on sources
This guide is AI-written and not individually human-reviewed. System features, seat numbers and where each system is used follow the published SQA National 5 Modern Studies course specification; verify current details and paper structure against the specification at sqa.org.uk.
Exam-style practice questions
Practice questions written in the style of SQA exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
SQA N5 style6 marksDescribe, in detail, two features of the Additional Member System (AMS) used to elect the Scottish Parliament. (6 marks)Show worked answer →
A knowledge (describe) question. The marker awards up to 3 marks per feature: identify it, then develop it with accurate detail about how it works.
Feature one: two votes. Each voter has two votes, one for a constituency MSP and one for a regional party list, so voters can support a local candidate and a party separately. Feature two: the proportional top-up. The 73 constituency seats are won by First Past the Post, then 56 regional list seats are allocated to make the overall result more proportional, topping up parties that won fewer constituencies than their vote share deserved. This gives 129 MSPs in total.
Each feature needs naming plus development. Two named features with no detail would stay low; two developed features reach 6.
SQA N5 style8 marksExplain, in detail, the advantages and disadvantages of using First Past the Post (FPTP). (8 marks)Show worked answer →
An explain question worth 8 marks, so the marker wants a balanced answer with developed advantages and disadvantages, each a point plus a consequence.
Advantages: FPTP is simple, the voter marks one X, so it is easy to understand and count, and it usually produces a single-party majority government that can pass laws without constant compromise, giving strong, stable government. Each constituency has one local MP, giving a clear local representative.
Disadvantages: it is not proportional, so a party can win a majority of seats with well under half the votes, and smaller parties with support spread thinly win few seats, which can feel unfair. Many votes are wasted in safe seats, which can lower turnout.
For 8 marks give at least one developed advantage and one developed disadvantage, each with a consequence. A one-sided answer caps lower.
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