The bill for amending the Constitution of the Republic of Singapore to implement the NMP scheme was introduced in Parliament and underwent its First Reading on 6 October 1989. On 30 November 1989, the bill was read a second time, and referred to a select committee. The report of the select committee was presented to Parliament on 15 March 1990, and the bill read a third time and enacted as the Constitution of the Republic of Singapore (Amendment) Act 1990 on 29 March 1990. It came into force on 10 September 1990.