The Western Isles are a constituency of the Scottish Parliament. The Scottish Parliament (Holyrood) has 73 constituencies, each electing one Member of the Scottish Parliament (MSP) by the first past the post system of election, and eight additional member regions, each electing seven additional member MSPs. ... The Scottish Parliament (Pàrlamaid na h-Alba in Gaelic, Scots Pairlament in Scots) is the national unicameral legislature of Scotland. ...

The constituency elects one Member of the Scottish Parliament (MSP) by the first past the post method of election. Also, however, it is one of eight constituencies in the Highlands and Islands electoral region, which elects seven additional members, in addition to eight constituency MSPs, to produce a form of proportional representation. Member of the Scottish Parliament (MSP) is the title given to any one of the 129 individuals elected to serve in the Scottish Parliament. ... The first-past-the-post electoral system is a voting system for single-member districts, variously called first-past-the-post (FPTP or FPP), winner-take-all, plurality voting, or relative majority. ... The Highlands and Islands is one of the eight electoral regions of the Scottish Parliament which were created in 1999. ... The Scottish Parliament (Holyrood) has 73 constituencies, each electing one Member of the Scottish Parliament (MSP) by the first past the post system of election, and eight additional member regions, each electing seven additional member MSPs. ... The Additional Member System (AMS) is a voting system where some representatives are elected from geographic constituencies and others are elected under proportional representation from party lists. ... Proportional representation (PR) is any election system which ensures a proportionally representative result of a democratic election, x% of votes should be represented by x% in the democratic institutions, parliament or congress. ...

The constituency area is also that of the Western Isles local government (unitary authority) council. The Outer Hebrides or Western Isles (Scottish Gaelic: Na h-Eileanan Siar), also traditionally known as the Outer Isles, comprise an island chain off the west coast of Scotland. ... A unitary authority is a type of local authority, which has a single-tier and is responsible for all local government functions within its area. ...