This publication aims to respond to the knowledge gaps faced by politicians, policymakers and practitioners involved in contemporary constitution building. Its principal aim is to provide a firstclass tool drawing on lessons from recent practice and trends in constitution building. It is divided into chapters which can be read as individual segments, while the use of a consistent analytical framework across each chapter provides a deeper understanding of the range of issues and forces at play in processes of constitutional development. The Practical Guide to Constitution Building reflects how fundamental constitution building is to the creation of sustainable democracy. Constitution building is a long-term and historical process and is not confined to the period when a constitution is actually written. While focusing on constitutions as key documents in themselves, this publication stresses understanding constitutional systems as a whole, including the relevant principles (chapter 2) and the need to build a culture of human rights (chapter 3), as well as the provisions for institutional design (chapters 4 to 6) and decentralized forms of government (chapter 7). It does not offer a blueprint or model for constitutions, but draws lessons from recent practice and knowledge. Among those lessons is that constitutions may well say one thing on paper but work differently in practice.