The accession process begins with the submission of an application for membership and has two main aspects: negotiations between the member member and the parties to the GPA on the offer of coverage of the GPA and the verification of the compliance of the member`s contracting rules with the requirements of the GPA, for example in terms of transparency, procedural fairness for suppliers and national control. The WTO secretariat provides technical assistance to help WTO members from developing countries who wish to learn more about the GPA and/or GPA. If so, and desired by the candidate countries, other intergovernmental organizations (for example. B regional development banks) or governance institutions may also provide technical assistance for GPA membership. The current signatories to this agreement (in April 2014) are: Canada, Chinese Taipei, the European Union – whose member states are Austria, Belgium, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands (including Aruba), Poland, Portugal, Slovakia, Slovenia, Sweden and the United Kingdom – Hong Kong, Iceland, Israel, Japan, Norway, South Korea, Liechtenstein, Singapore, Switzerland and the United States. Any other WTO member government may accede to this agreement on terms agreed by that government and the current signatories. Amp signatories are required to publish summary notices on the potential to purchase contracts covered by the agreement. Each member has identified publications in which these sales opportunities are displayed. Publications are listed in Appendix II (local link). The revised GPA, which came into force on 6 April 2014, is attracting increasing attention around the world, but the liberalisation of public procurement is not a completely new idea.
Within the OECD, efforts have been made at an early stage to ensure that public procurement is subject to internationally accepted trade rules. The case was then included in the Tokyo trade negotiations under the GATT in 1976. The GPA contains a number of provisions to ensure that tendering procedures for public procurement are transparent, effective and fair in the signatory countries. The signatories agreed that the Public Procurement Agreement (GPA) is a multi-lateral agreement, under the auspices of the World Trade Organization (WTO), which governs the purchase of goods and services by the public authorities of the contracting parties and is based on the principles of openness, transparency and non-discrimination. Many buying opportunities are also published electronically. The agreement came into force in 1979 as the Tokyo Round Code on Government Procurement, which came into force in 1981 under the General Agreement on Tariffs and Trade.  It was then renegotiated in parallel with the 1994 Uruguay Round and this version came into force on 1 January 1996.