What are quasi-judicial bodies as a formulation in international law? Though these are currently legion at the international level, there is yet to be a rigorous analysis of them as a category. This book fills this gap by setting out a comprehensive and detailed map of this quasi-judicial terrain. Taking a comparative approach, it looks at the form and function of these bodies, as well as commenting on their effectiveness. It goes further to explore their understanding at the domestic and international court level. This is a fascinating study that will be of interest to all scholars of international courts and institutions.