additional member system
C2Formal, Technical, Academic
Definition
Meaning
A mixed electoral system where voters cast two votes: one for a constituency representative and one for a party list, with list seats allocated to correct overall proportionality.
A hybrid voting method designed to combine the direct representation of single-member constituencies with the proportional outcomes of party-list systems, often used to balance local accountability with fair party representation.
Linguistics
Semantic Notes
Primarily a term of political science and constitutional law. Often abbreviated as AMS. It is a specific type of mixed-member proportional (MMP) representation.
Dialectal Variation
British vs American Usage
Differences
The term is more established in UK political discourse (e.g., Scottish Parliament, Welsh Senedd). In the US, 'mixed-member proportional system' or 'MMP' is more common in academic literature, as no major US election uses it.
Connotations
In the UK, it is associated with devolved legislatures and electoral reform debates. In the US, it is a purely academic/ comparative politics term with no direct political application.
Frequency
High frequency in UK political science and news media during electoral reform discussions; very low frequency in general American English.
Vocabulary
Collocations
Grammar
Valency Patterns
The [legislative body] uses the additional member system.They voted to adopt an additional member system.Seats are allocated under the additional member system.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “top-up seats (refers to the list members in AMS)”
Usage
Context Usage
Business
Not applicable.
Academic
Common in political science, comparative politics, and constitutional law texts discussing electoral engineering.
Everyday
Rare, except in countries/regions using it (e.g., Scotland, Wales), where it may be discussed during elections.
Technical
Precise term in electoral system design, with specific formulas for seat allocation (e.g., D'Hondt method).
Examples
By Part of Speech
verb
British English
- The commission recommended to **additional-member-system** the Welsh elections. (Note: highly non-standard, used here illustratively)
American English
- The proposal seeks to **AMS-ify** the state legislature. (Note: highly non-standard, used here illustratively)
adverb
British English
- The body was elected **additional-member-systemly**. (Note: highly non-standard, used here illustratively)
American English
- They voted **via an AMS procedure**. (Prepositional phrase used adverbially)
adjective
British English
- The **additional-member-system** model used in Scotland.
American English
- An **AMS-style** electoral reform proposal.
Examples
By CEFR Level
- Some countries have a different way of voting.
- In an additional member system, people have two votes.
- The Scottish Parliament is elected using the additional member system, which combines local and party-list representation.
- Critics of the additional member system argue that while it enhances proportionality, it can create two classes of representatives with differing legitimacy.
Learning
Memory Aids
Mnemonic
Think: ADD a few more members to the system to make the results fairer and more proportional.
Conceptual Metaphor
ELECTORAL SYSTEMS ARE MACHINES (with parts that 'top up' or 'compensate' for imbalances).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct translation as 'дополнительная система члена'. The correct equivalent is 'смешанная избирательная система с компенсационными мандатами' or 'система дополнительных членов'.
Common Mistakes
- Using 'additional member system' to refer to any mixed system (it's a specific type).
- Confusing it with the Alternative Vote (AV), which is a different reform.
Practice
Quiz
What is a key feature of the Additional Member System (AMS)?
FAQ
Frequently Asked Questions
It is a specific type of PR, specifically a mixed-member proportional (MMP) system. Not all PR systems are AMS, but AMS is a form of PR.
It is used for elections to the Scottish Parliament, the Welsh Senedd, and the London Assembly. Variations are used in Germany, New Zealand, and several other countries.
The 'additional' or 'list' members are allocated to political parties to 'top up' their seat totals, making the overall distribution of seats in the legislature more proportional to the share of votes each party received.
Not perfectly. The degree of proportionality depends on factors like the percentage of seats allocated from lists and the specific mathematical formula used to allocate them. It is more proportional than a pure majoritarian system.