This book analyses the role of international organisations in WTO dispute settlement as arising from a number of WTO disputes. In particular, the roles of the IMF, WIPO, WCO and WHO are addressed. The use of the Vienna Convention rules of interpretation framework allows an evaluation of the weight attributed to this material by the WTO adjudicator. This allows specific conclusions to be drawn regarding the level of institutional sensitivity of the WTO adjudicator to each of the organisations. As well as being a valuable source of research, the analysis will appeal to international law scholars, civil servants and law practitioners interested in the WTO and dispute settlement.