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How to use this

Two grids on the same template. The first is empty - print it, fill in each cell with a one-line note while you revise. The second is a worked example to check yourself against.

Each cell asks one question: does this row strengthen the column quality (mark +) or weaken it (mark -)? Then add a one-line note saying why. The plus and minus columns are deliberately not pre-printed - your judgement is the work.

Proportional result = do seats match the share of votes? Strong single-party govt = does it deliver strong single-party government? Voter choice = does it give voters real choice? MP-constituency link = is there one clear local representative? Simple for voters = is it simple to use and count? Fair to small parties = are smaller parties fairly represented?

UK electoral systems - judgement grid +   -

Empty version. Print and fill in.
System+   - Proportional result Strong single-party govt Voter choice MP-constituency link Simple for voters Fair to small parties
FPTP
AMS
STV
SV
How to use the grid in an essay. Pick the column the question asks about, read down it across the rows, and judge where they agree and where they differ.

UK electoral systems - judgement grid +   -

Filled version. Use this to check your own grid - and tap any cell for the full detail behind the judgement.
System+   - Proportional result Strong single-party govt Voter choice MP-constituency link Simple for voters Fair to small parties
FPTP -Poorly: 2024 saw Labour win 33.7% of votes but 411 seats (63.2%) and a majority of 174. +Well, usually: it normally produces single-party majority government, though 2010 and 2017 strained that. -Poorly: one cross only, and in safe seats the result is known in advance, driving tactical voting. +Well: relatively small single-member seats give every voter one clear, accessible local MP. +Well: one cross, few spoiled ballots and fast, clear results. -Poorly: it rewards concentrated support and punishes spread support (SNP 2.5% beat Reform's 14.3% on seats).
AMS +Well: the regional list top-up seats correct the disproportionality the FPTP half produces. -Poorly: coalition or minority government is the norm, with policy settled by post-election deals. +Well: two votes that can be split between different parties. ±Partly: it keeps a local constituency member but creates two classes of member. ±Partly: more complex than FPTP, with two votes and a closed list set by party leaders. +Well: top-up list seats let smaller parties win seats in line with their support.
STV +Well: highly proportional, with very few wasted votes, which is why it suits power-sharing. -Poorly: coalition government is built in. +Well: the widest voter choice of any UK system, ranking candidates across and within parties. ±Partly: every area still has members, but large multi-member seats dilute the single-MP link. -Poorly: complex counts, with surplus and eliminated votes transferred on preferences. +Well: highly proportional, so smaller parties win seats in line with support.
SV -Poorly: a majoritarian single-winner system, not designed to be proportional. +Well: it elects a single winner with a broader mandate than a plain plurality. ±Partly: a first and second choice, but a second choice only counts if it is for one of the top two. +Well: it elects one representative for a single post (a mayor or PCC), a clear single mandate. ±Partly: more than one cross, and a second choice that only counts in limited cases. -Poorly: a single-winner majoritarian system favours the leading candidates.
What the filled grid shows. Read down each column to see which rows score plus, mixed or minus - the pattern that drives the judgement.
See also