On 27 June 2001, the International Court of Justice rendered its final decision in the case of LaGrand (Germany v. United States of America), which deals with many complex issues of international law. Apart from the very interesting substantive legal issues relating to the regime of consular assistance and death penalty in international law, the Judgment of the Court contains significant principles and reflections as to the essence and scope of international judicial jurisdiction. In contrast to the traditional approach to this question, the Court's Judgment is concerned with practical and specific aspects of jurisdiction in action, rather than dealing with general assumptions and conceptions surrounding the problem. From this point of view, the present contribution examines the significance of LaGrand as a case in which the traditional assumptions on international judicial jurisdiction are tested and reappraised.