Amicus curiae participation in international courts is steadily growing since the late 1990 despite lack of clarity on the concept's nature, function and utility in international dispute settlement. Does amicus curiae infuse international judicial proceedings with alternative views, including the public interest in a case, as often advocated by NGOs? Does it increase the legitimacy and transparency of international dispute settlement, or the coherence of international law? Or is it an unhelpful impostor that impedes negotiated solutions and derails the proceedings at the expense of the parties to advance its own agenda? By way of an empirical-comparative analysis of the laws and practices of the ICJ, the ITLOS, the ECtHR, the IACtHR, the IACtHPR, WTO panels and the Appellate Body, and investment arbitration the dissertation examines the status quo of amicus curiae before international courts and tribunals to determine if the current amicus curiae practice is of added value to international proceedings and international dispute settlement in general. The dissertation shows that there is no common concept of international amicus curiae, but that amicus curiae before the international courts examined share a few characteristics. A proposed functional systematization highlights overlaps and diverging |