This article traces the development of the International Court of Justice from the establishment of its predecessor in 1919, the Permanent Court of International Justice. The article explores the place of the ICJ in the international settlement of disputes including issues relating to the proliferation of international courts and tribunals; the selection and impartiality of judges; provisional measures; the willingness of states to accept the jurisdiction of the ICJ; compliance with the Court’s rulings; and where the ICJ has seen the greatest success in developing its jurisprudence. Specific attention is paid to the ICJ’s advisory and contentious jurisdictions. The article concludes with an assessment of its contribution to international law.