You are not currently logged in. Please create an account or log in to view the full course.

Electoral Systems

4. Proportional Electoral Systems

This is the course trailer. Please create an account or log in to view this lecture.

  • Description
  • Cite

About this Lecture


In this module, we think about the proportional electoral systems operating in the UK, focusing in particular on: (i) the additional member system (AMS) and how it attracts a greater number of parties whilst improving the electoral fortunes of smaller parties; (ii) single transferable vote (STV), considered by many to be the most proportional of all electoral systems; and (iii) supplementary vote (SV), used mainly in mayoral elections throughout England.


In this course, Professor David Denver (University of Lancaster) examines the electoral systems in operation across the United Kingdom. We begin by thinking about the basic functions that an electoral system performs before briefly introducing the main electoral systems used in the UK. We then consider first past the post (FPTP), focusing in particular on the importance of constituencies and the advantages and disadvantages of the system. Finally, we explore the proportional electoral systems used in the UK, such as the alternative member system (AMS), single transferable vote (STV), and supplementary vote (SV).


Professor David Denver is Emeritus Professor at the University of Lancaster. He specialises in studying elections and also has a research interest in Scottish politics. He is the author of a widely used text on electoral behaviour (Elections and Voters in Britain) and of numerous other pieces on the subject. Among other positions held, he is the Chair of the editorial board of the Journal of Elections, Public Opinion and Parties and Chair of the publications subcommittee of the Political Studies Association.

Cite this Lecture

APA style

Denver, D. (2019, September 26). Electoral Systems - Proportional Electoral Systems [Video]. MASSOLIT.

MLA style

Denver, D. "Electoral Systems – Proportional Electoral Systems." MASSOLIT, uploaded by MASSOLIT, 26 Sep 2019,