The April 1990 conference approved sweeping political reforms, including creation of a national Senate, decentralization of the budgetary process, freedom of assembly and press, and cancellation of an exit visa requirement. In an attempt to guide the political system's transformation to multiparty democracy, Bongo resigned as PDG chairman and created a transitional government headed by a new Prime Minister, Casimir Oye-Mba. The Gabonese Social Democratic Grouping (RSDG), as the resulting government was called, was smaller than the previous government and included representatives from several opposition parties in its cabinet. The RSDG drafted a provisional constitution in May 1990 that provided a basic bill of rights and an independent judiciary but retained strong executive powers for the president. After further review by a constitutional committee and the National Assembly, this document came into force in March 1991.