The Scottish Parliament comprises 129 members (MSPs) who are elected for four-year terms under the mixed member proportional representation system. The Scotland Act 1998 enabled the Scottish Parliament to pass primary legislation on devolved issues.
The Scottish Government (formerly known as the Scottish Executive) was established in 1999 following the first elections to the Scottish Parliament. The current administration was formed after elections in May 2011 and comprises the First Minister and an eight-member cabinet.
The Scotland Office manages day-to-day devolution issues between Westminster and Holyrood.