This book consists of a collection of proceedings from the conference "Building Peace in Post-Conflict Situations" organized by the British Institute of International and Comparative Law in February 2011. This conference formed part of the ATLAS project (Armed Conflicts, Peacekeeping; Transitional Justice - Law as Solution) that involves several research institutions across Europe and is funded by the European Commission under its 7th Framework Program. The project makes recommendations to the European Union as to how the EU could best improve its external policy in conflict and post-conflict situations, with particular consideration of transitional justice institutions. More specifically, the conference tackled issues pertaining to different mechanisms used to achieve national reconciliation, to international prosecution, and to the reparation of victims. The ATLAS project also integrated a practical component, and, comprised of the organization of field missions in Cambodia, Sierra Leone, and Bosnia-Herzegovina in 2010, it presents its findings in this book.