The Scottish Parliament was created after a referendum on devolution took place on 11 September 1997 in which 74.3% of those who voted approved the idea. The Scotland Act (1998) was then passed by the UK Parliament which established the devolved Scottish Parliament and Scottish Executive. The parliament was elected using Mixed-member proportional representation, combining 73 (First-past-the-post) constituencies and proportional representation with the 73 constituencies being grouped together to make eight regions each electing seven additional members to make a total of 129. This meant that it would be unlikely for any party to gain a majority of seats in the new parliament and either minority or coalition Scottish Executives would have to be formed.