Although 29 least developed countries that had been contracting parties of the General Agreement on Tariffs and Trade became de facto WTO members, others have had to negotiate their accession to WTO.
Si 29 PMA anciennement parties contractantes à l'Accord général sur les tarifs et le commerce sont devenus de facto membres de l'OMC, d'autres ont dû négocier leur adhésion à cette organisation.