Drawing on publicly available arbitral case law supplemented with personal interviews with investment arbitrators, the author touches on such concepts and practices as the following: The core of the book proposes a novel, full-edged dialogical network theory for analysing the interpretation process. As an exemplary demonstration of developing theory to keep up with practice, this unique book provides a deeply engaged means for enhancing the practice of international arbitration. Its introduction of a new field of interdisciplinary analysis employing legal argumentation theories is sure to provide inestimable guidance for institutions and policymakers, especially in light of recent proposals for the creation of a permanent investment arbitration court. Given that unveiling the legal decision-making process is critical for the well-being of the whole dispute resolution procedure, and that being aware of how arbitrators interpret the law can constitute a roadmap for counsel's arguments and approaches when dealing with cross-border disputes, the topic of this book is relevant for both academics and practitioners, and its signifcance can only grow as recourse to investor-state arbitration continues to expand.