This work investigates the evolution and application of international legal principles through the jurisprudence of the International Court of Justice over a fifty-year period. The author, H. W. A. Thirlway, leverages his professional background as a former Principal Legal Secretary to the Court to synthesize decades of legal analysis. By consolidating his contributions to the British Yearbook of International Law, the text provides a structured framework for understanding the Court's procedural and substantive developments.

Legal scholars and practitioners frequently cite this work as a foundational resource for understanding the internal logic and procedural history of the International Court of Justice. Experts highlight the text's academic density and its value as a reference tool for those studying the evolution of international judicial practice.