This text investigates the core substantive principles governing international investment arbitration and how these principles are applied by tribunals to resolve cross-border disputes. The authors, Campbell McLachlan, Laurence Shore, and Matthew Weiniger, leverage their extensive expertise in international law to provide a structured analysis of the legal frameworks that define investor-state relations. By synthesizing tribunal decisions and treaty interpretations, the authors establish a coherent framework for understanding the evolving landscape of international investment law.

Legal practitioners and scholars frequently cite this work as a foundational reference for understanding the substantive law of investment arbitration. Experts highlight the clarity of the authors' analysis, noting its utility for both academics and counsel navigating complex international disputes.