The Agreement on Government Procurement (GPA) is a plurilateral agreement under the auspices of the World Trade Organization (WTO) that entered into force in 1981. It was then renegotiated in parallel with the Uruguay Round in 1994, and entered into force on 1 January 1996. The agreement was subsequently revised on 30 March 2012. The revised GPA came into effect on 6 July 2014. It regulates the government procurement of goods and services by the public authorities of the parties to the agreement, based on the principles of openness, transparency and non-discrimination.