This book provides the most comprehensive and scientific assessment to date of what it means to appear before war crimes tribunals. This ground-breaking analysis, conducted with the cooperation of the International Criminal Tribunal for the former Yugoslavia (ICTY) Victims and Witnesses Section, examines the positive and negative impact that testifying has on those who bear witness to the horrors of war by shedding new light on the process. While most witnesses have positive feelings and believe they contributed to international justice, there is a small but critical segment of witnesses whose security, health, and well-being are adversely affected after testifying. The witness experience is examined holistically, including witness' perceptions of their physical and psychological well-being. Because identity (gender and ethnicity) and war trauma were central to the ICTY's mandate and the conflicts in the former Yugoslavia, the research explores in-depth how they have impacted the most critical stakeholders of any transitional justice mechanism: the witnesses.