This path-breaking new textbook provides a broad overview of the core concepts, actors and activities involved in building security and justice after conflict, as well as challenges and lessons learned in this field. Drawing attention to the principles which guide - or should guide - this kind of work, as well as using practical examples throughout, the book covers a uniquely wide range of issues in peacebuilding - from transitional justice and disarmament to security sector reform and human rights. It concludes by considering both the regional and more far-reaching impacts of conflict, including such global phenomena as terrorism, piracy and organised crime. With a decade of experience working in post-conflict zones for the UN and other organisations, and a further 10 years in academia and as a consultant for various international organisations, the author's unparalleled expertise on the topic and her accessible writing style make this book the essential guide to postgraduate and upper-level undergraduate courses on peace and conflict studies. The text is also important supplemental reading for those studying war, peace, development, security or IR in a wider context and for practitioners and policy-makers in the field of peacebuilding.