The first part of this book deals with the general principles relating to international disputes settlement. It starts by looking at the nature of an international dispute in contemporary international law, and by discussing the principles governing the ascertainment of the existence of an international dispute. It then moves on to a consideration of the diplomatic means of an international dispute settlement. The book not only focuses on the peaceful means, but also considers other means, in particular countermeasures. A separate chapter is devoted to the International Court of Justice, enabling in-depth treatment of the issues. The book critically analyses the cases in which Australia and New Zealand have been involved, first as applicants, and then as respondents, thereby assessing the contributions made by these two countries to the development of the law relating to international disputes settlement.