In Principles of Evidence in Public International Law as Applied by Investor-State Tribunals, Kabir Duggal and Wendy Cai explore the fundamental principles of evidence and how these principles relate to burden of proof and standard of proof. By tracing the applications of major principles recognized by the International Court of Justice and applied by investor-state tribunal jurisprudence, the authors offer valuable insight into the interpretation, understanding, and nuances of indispensable principles of evidence, an area that has been ignored in both investor-state arbitration and public international law more generally.