As well as being a concluding chapter of the Handbook, the chapter provides succinct analysis of the future of treaty practice and identifies factors that may contribute to future change. It then looks at how these influential factors are changing treaty practice now, the direction those changes might take in the future and how Treaty Offices may best prepare themselves to handle the predictable and the unpredictable challenges. It emphasises that treaty practice is not merely an adjunct to the law of treaties; it is a specialisation in its own right in which treaty professionals participate in evolutions in practice as well as react to external developments.