The signatories of the GPA agreed that companies from other signatory countries will not be treated less favourably in terms of public procurement than domestic firms, in accordance with the principles of national treatment and non-discrimination. Locally created businesses are no less well treated because they are of foreign origin or because the goods and services they offer are of foreign origin. 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. On March 30, 2012, the parties to the GPA adopted a review of the GPA. The revised agreement expands the markets covered by the GPA to provide U.S. products, services and suppliers with new opportunities to participate in centralized and sub-centralized procurement in other GPA parties. The revised agreement also provides for a substantial improvement in the text of the treaty by modernising the text to take into account current procurement practices and to clarify its commitments. The revised agreement enters into force for the parties who accepted it on the 30th day after it was tabled by two-thirds of the parties to the current agreement and, subsequently, for each of the parties that accept it on the 30th day following its adoption. The Review Body on Bid Challenges is an organization set up by party states that allows suppliers to challenge irregular government tenders.
 These bodies are independent and strive to deal with each case quickly. The review body is also empowered to recommend rapid interim measures, which can be recommended within days, when an evaluation body finds a first-application case for an auction challenge.  In order to be covered by the GPA, public procurement must meet minimum value thresholds. These vary depending on the type of purchasing unit and the contract. You will find the current thresholds in the WTO`s table of thresholds (link offsite). The MPA applies to purchases by any contractual means, including purchase, lease or lease with or without an option to purchase. It applies to companies that each signatory country has listed in Schedule I (link offsite) of the agreement. Appendix I of Schedule I is the list of entities covered by headquarters, Schedule 2 of central government entities and Schedule 3 of the other entities.