Investor-state arbitration is a form of dispute settlement that allows foreign investors the opportunity to seek compensation for damages or discriminatory practices, most of which arise out of breaches of treaty obligations by the governments of host countries. With a high level of public interest involved in these cases, the awards of these tribunals are subject to much scrutiny and debate. As a result, up-to-date knowledge of the key topics of investment arbitration is integral for those practicing in the field, especially given the rapid development of international investment law. This book describes the most important procedural and substantive aspects of investment arbitration in a practical and accessible manner. Covering all procedural stages of investor-state arbitration, the text provides a broad overview of the key topics including the role of precedent, counterclaims, third party funding, bi-trifurcation, burden of proof regarding jurisdiction, attribution, breach of treaty and contract claims, fair and equitable treatment, indirect expropriation, and culminates in the enforcement of investment awards. The text also describes the conflicts and challenges facing arbitrators from a practical perspective, providing a comprehensive insight into investor-state arbitration.