International investment cases show the frequent use of good faith arguments by both investors and respondent states. These cases also illustrate how parties and tribunals tend to conceptualize the good faith principle which has become an important rule of international investment law. This article will explore recent trends in order to assess the importance of this argument for both parties and at different stages of the proceeding. This article will also provide an overview of responses given by the tribunals faced with good faith arguments. Whereas claimants have traditionally relied on this concept to argue the breach of fair and equitable treatment and legitimate expectations, recent cases such as Inceysa, Phoenix and TSA Spectrum, indicate a new defence strategy for respondent states. Given the fact that investment tribunals have shown willingness to treat the good faith principle as autonomous and as a self-standing standard, the possibilities for respondent states have increased. Respondent states can rely on good faith to deny the right of claimants to seize the tribunal (Article 41(5) of the ICSID Rules), to challenge the jurisdiction of the tribunal or admissibility, to contest the right of the claimant to have a decision in its favour, or to challenge the right to compensation.

Written by a leading legal researcher, this book offers a comprehensive study of the principle, a frequently invoked but rarely analysed aspect of investment arbitration. It is a thorough and expansive study that considers the application of good faith by arbitral tribunals and parties in international investment disputes, encompassing both procedural and substantive aspects of good faith. Expertly negotiating a complex principle, this book diligently follows the arbitral process from jurisdiction through merits and to cost decisions, identifying the various applications of good faith in investment disputes. The author offers detailed analyses of the role of good faith in defining nationality and investor as well as in pre-dispute admissibility requirements. The study then delves into the ways the principle guides parties' arguments and informs tribunals' decisions regarding evidence, substantive protections, and costs. It further addresses the role of good faith in the behaviour of arbitrators and other actors. This is a guide for anyone wishing to understand this important principle that has accompanied the developing system of international investment law.

Although considered a somewhat ‘hazy’ concept (particularly in common law), good faith may nevertheless be defined as a duty incumbent on a person negotiating or performing an agreement. Thus, it may be understood as obligatory on all parties in the conduct of arbitral proceedings. In this collection of expert chapters, notable jurists and legal academics from around the world fully investigate the multifaceted notion of good faith in international arbitration. All the following aspects of the matter are covered: detailed analysis of good faith in both common law and civil law traditions as reflected in doctrine, scholarship, and case law; good faith implications in treaty interpretation; using good faith as a negative defence against claims or as a positive basis for claims; good faith in the specific field of international investment arbitration; procedural aspects of the parties’ obligation to act in good faith during pre-arbitral negotiations, conciliation, and mediation, as well as during the arbitral proceedings; the duty of arbitrators and arbitral institutions to act in good faith; and the role of good faith in actions to set aside. As an authoritative survey and analysis of how the concept of good faith has been applied in international arbitration – and defined in the case law relevant to it – this matchless book provides invaluable guidance to parties involved in international arbitral proceedings.

General Principles of Law in Investment Arbitration surveys the function of general principles in the field of international investment law, particularly in investment arbitration. The authors’ analysis provides a representative case study of how this informal source operates alongside and in the absence of other sources of applicable law. The contributions are divided into two parts, devoted respectively to substantive principles and procedural ones. The principles discussed in the book are selected for their currency in the practice, their contested nature and their relevance.

Good Faith in International Investment Arbitration offers a comprehensive study on both the theory and application of the principle of good faith in the international arbitration process. It is an essential book for both practitioners and academics.

The Handbook of International Investment Law and Policy is a one-stop reference source. This Handbook covers the main conceptual questions in a logical, scholarly yet easy to comprehend manner. It is based on a truly global vision insisting particularly on Global South related issues and developments. In this respect, the Handbook of International Investment Law and Policy provides an excellent modern treatment of international investment law which is one of the fastest growing areas of international economic law. Professor Julien Chaisse, Professor Leïla Choukroune, and Professor Sufian Jusoh are the editors-in-chief of the Handbook of International Investment Law and Policy, a 1,500-page reference book, which is anticipated becoming one of the most influenced reference books in the international economic law areas. This Handbook is a highly comprehensive set of four volumes of original materials designed to cover all facets of international investment law and policy. The chapters, written by world-leading experts, explore key ideas and debates in relation to: international investment substantive law (Volume I), Investor-state dispute settlement (Volume II); interaction between international investment law and other fields of international law (Volume III); and, the new trends and challenges for international investment law (Volume IV). The Handbook will feature more than 80 contributions from leading experts (academics, lawyers, government officials), including Vivienne Bath, M. Sornarajah, Mélida Hodgson, Rahul Donde, Roberto Echandi, Andrew Mitchell, Ernst-Ulrich Petersmann, Christina L. Beharry, Krista Nadakavukaren Schefer, Leon Trakman, Prabhash Ranjan, Emmanuel Jacomy, Mariel Dimsey, Stavros Brekoulakis, Romesh Weeramantry, Nathalie Bernasconi-Osterwalder, David Collins, Damilola S. Olawuyi, Katia Fach Gomez, Jaemin Lee, Alejandro Carballo-Leyda, Patrick W. Pearsall, Mark Feldman, Surya Deva, Luke Nottage, Rafael Leal-Arcas, James Nedumpara, Rodrigo Polanco, etc. This Handbook will be an essential reference tool for students and scholars of international economic law. Policy makers and researchers alike will find the Handbook of International Investment Law and Policy useful for years to come.

There is a great degree of controversy on the proper complexion and role of general principles of law in the international legal order. Opinions range from total rejection of some types of principles to the most enthusiastic endorsement of principles as the necessary oil for the many complex wheels of the legal order. In this book one of the leading public lawyers of his generation explores the concept of good faith and its role in international law. Rather than offer a detailed, comprehensive examination, Kolb aims to map the true points of gravity of the principle of good faith in the international legal order. In so doing, he illustrates how the various legal institutions who operate in the sphere of public international law allow the principle of good faith to unfold.