Incidental Jurisdiction in International Adjudication and Incidental Determinations by International Organizations

International courts and tribunals have developed two criteria for the exercise of incidental jurisdiction: necessity and ancillarity. Yet the question of whether to make an incidental determination is not unique to the adjudicatory context. International organizations sometimes confront it as well. And their practice in dealing with this question suggests that the criteria of necessity and ancillarity alone are insufficient for assessing whether an incidental determination should be made.