This work investigates the legal significance and application of Article 31(3)(c) of the Vienna Convention on the Law of Treaties as a mechanism for systemic integration in international law. Campbell McLachlan KC examines how this specific provision, once considered obscure, functions as a bridge between disparate international legal regimes. By analyzing the International Law Commission's findings on fragmentation, the author argues that systemic integration serves as a vital interpretive tool for maintaining coherence within the international legal order.

Legal scholars and practitioners identify this text as a definitive analysis of the principle of systemic integration within the context of treaty interpretation. Experts frequently cite the work for its clarity in addressing the complexities of international legal fragmentation.