I The Presumption in Violation Complaints
(i)Introduction
During decades of experience, Art. XXIII:1(a) has formed the basis of almost all disputes under the GATT 1947 and the WTO Agreement. Dispute settlement under the GATT/WTO has always been dominated by violation complaints.
The concept of so-called violation complaints, developing from the provision of XXIII:1(a), refers to those complaints brought before the DSB by a WTO member when it thinks that any benefit accruing to it directly or indirectly under the covered agreement is being nullified or impaired as a result of the failure of another member of the WTO to carry out its obligations under that agreement. In 1960, the CONTRACTING PARTIES decided that a GATT-inconsistent measure was presumed to cause nullification or impairment and that it was up to the party complained against to demonstrate that this was not the case.1 This principle was assimilated in the dispute settlement procedures adopted at the end of the Tokyo Round, and is now reflected in Art. 3.8 of the DSU, which reads: