With the ad hoc tribunals completing their mandates and the International Criminal Court under significant pressure, today's international criminal jurisdictions are at a critical juncture. Their legitimacy cannot be taken for granted. This multidisciplinary volume investigates key issues pertaining to legitimacy: criminal accountability, normative development, truth-discovery, complementarity, regionalism, and judicial cooperation. The volume sheds new light on previously unexplored areas, including the significance of redacted judgements, prosecutors' opening statements, rehabilitative processes of international convicts, victim expectations, court financing, and NGO activism. The book's original contributions will appeal to researchers, practitioners, advocates, and students of international criminal justice, accountability for war crimes and the rule of law.