This Handbook aims to provide practical guidance on good treaty practice. It presents a range of examples from the practice of several States and international organisations and explains the actions that need to be taken to create a new treaty, bring it into force, operate it, amend it and wind it up, on both the international and the domestic plane. It also explores what constitutes good treaty practice, and develops generic principles or criteria against which to evaluate these examples. It provides a useful analytical tool to enable each government and international organisation to identify and develop the best treaty practice for their circumstances, recognising that one size does not necessarily fit all. It will be of interest to those working with treaties and treaty procedures in governments, international organisations and legal practice, as well as legal academics and students wishing to gain insight into the realities of treaty practice.