The 1970 Assembly framed the 1973 Constitution which was passed on 12th April and promulgated on 14th August 1973. The 1973 Constitution provides for a parliamentary form of Government with a bicameral legislature, comprising of the National Assembly and the Senate. The membership of the Senate, which was originally 45, was raised to 63 in 1977 and to 87 in 1985. The government of Gen. Pervez Musharraf raised the membership of the Senate from 87 to 100 in 2002.