A common system of election to the European Parliament is called for in the 1957 Treaty of Rome, but this clause has never been implemented. The literature on constituency service and the perceptions of representatives suggests that representatives from single-member districts should have a stronger constituency orientation and electoral connection than representatives from multi-member districts. The attitudes and behavior of British and French MEPSs are used to test this assertion.

http://www.jstor.org/pss/2600420