Formal negotiations began in December 1991 at the Convention for a Democratic South Africa (CODESA). The parties agreed on a process whereby a negotiated transitional constitution would provide for an elected constitutional assembly to draw up a permanent constitution. The CODESA negotiations broke down, however, after the second plenary session in May 1992. One of the major points of dispute was the size of the supermajority that would be required for the assembly to adopt the constitution: The NP wanted a 75 per cent requirement, which would effectively have given it a veto.