Decisions of international courts and arbitrators, as well as judgments of national courts, are fundamental elements of modern public international law. The International Law Reports is the only publication in the world wholly devoted to the regular and systematic reporting in English of such decisions. It is therefore an absolutely essential work of reference. Volume 172 is devoted to the 2014 judgment of International Court of Justice in Maritime Dispute (Peru v. Chile), the judgment of South African Constitutional Court in National Commissioner of the South African Police Service v. Southern Africa Human Rights Litigation Centre and the 2016 judgment of the English High Court in R (Freedom and Justice Party) v. Secretary of State for Foreign and Commonwealth Affairs.