This volume examines the evolving state of international law and diplomatic relations during the mid-1960s. The authors, including prominent legal scholars Humphrey Waldock and R. Y. Jennings, utilize the research resources of the Royal Institute of International Affairs to analyze the legal frameworks governing state conduct. The text provides a systematic review of treaties, judicial decisions, and international practice as they stood in 1964.

Experts recognize this volume as a valuable historical record for understanding the mid-century approach to international jurisprudence. Scholars often cite the work for its detailed documentation of the legal climate during a period of significant geopolitical transition.