NMPs were made a permanent feature of Parliament with effect from 1 July 2010. Prior to this change, Parliament had to decide within six months after every election whether to appoint NMPs. The rationale for the changes was given by Prime Minister Lee Hsien Loong in Parliament on 27 May 2009. According to him, the main motivation behind having NMPs as a permanent part of the system of government in Singapore was the fact that the scheme had been a great success and had improved the quality of debate in the House: "The scheme has worked well. The NMPs represent non-partisan alternative views in Parliament, and the NMPs have made effective contributions and raised the quality of debate in Parliament. Sometimes, if I may say so, they may have outshone even the Opposition MPs. This NMP scheme should be a permanent part of our political system."