Scottish Parliament: Structure and Electoral Systems
The Scottish Parliament serves as the devolved legislature for Scotland, meaning it has the authority to pass laws and manage specific government functions within the country. Established in 1999, this institution represents the voice of the Scottish people through a unique blend of electoral methods designed to balance local representation with overall proportionality.
The Parliament is composed of 129 Members of the Scottish Parliament, commonly referred to as MSPs. To ensure a fair distribution of seats, the body utilizes the Additional Member System (AMS), a hybrid voting method that combines two different styles of election.

How MSPs Are Elected
The election of the 129 MSPs is split into two distinct categories to ensure that the final makeup of the Parliament reflects the popular vote as accurately as possible.
Constituency Representatives
A total of 73 MSPs are elected via the first-past-the-post system. In this method, the country is divided into single-member constituencies, and the candidate who receives the most votes in each specific area wins the seat.
Regional Representatives
To correct any imbalances created by the first-past-the-post system, an additional 56 MSPs are elected through regional lists. Scotland is divided into 8 regions, with each region electing 7 MSPs. This process ensures that the final results are proportional to the total number of votes cast for each party.
Maintaining Parliamentary Seats
When a constituency seat becomes vacant—typically due to the resignation or death of a member—a by-election is held to fill that specific position. While these are standard procedures for maintaining full representation, they do not occur in every term. For example, there were no by-elections recorded during the 3rd Scottish Parliament term, which spanned from 2007 to 2011.
Summary of Parliamentary Composition
| Category | Number of MSPs | Election Method | Details |
|---|---|---|---|
| Constituencies | 73 | First-past-the-post | Single-member districts |
| Regions | 56 | Proportional Representation | 8 regions (7 MSPs each) |
| Total | 129 | Additional Member System | Hybrid System |
Key Facts
- The Scottish Parliament was founded in 1999.
- There are 129 total Members of the Scottish Parliament (MSPs).
- The Additional Member System (AMS) is used to combine local and proportional representation.
- 73 members are elected from single-member constituencies.
- 56 members are elected across 8 regions.
- By-elections occur only when a constituency seat becomes vacant.
Frequently Asked Questions
When was the Scottish Parliament established?
The Scottish Parliament was founded in 1999 as the devolved legislature for Scotland.
What is the Additional Member System?
The Additional Member System is a hybrid electoral method that uses both first-past-the-post voting for constituencies and proportional representation for regional seats.
How many MSPs represent each region?
There are 8 regions in total, and each region elects 7 MSPs.
What triggers a by-election in the Scottish Parliament?
A by-election is triggered when a constituency seat becomes vacant due to the death or resignation of the sitting member.
Were there any by-elections between 2007 and 2011?
No, there were no by-elections during the 3rd Scottish Parliament term (2007–2011).