Judicial Reasoning and Non-State Participation before Inter-State Courts and Tribunals

The present article explores the premise that the participation of non-State actors may in some instances be necessary to the conduct of contentious or advisory proceedings before inter-State courts and tribunals. It first considers whether such necessity may be directly asserted as a legal requirement, in the absence of lex specialis treaty mechanisms or party consent. The article thus considers the potential to apply general principles of law, customary international law, and doctrinal concepts to this question. Unsatisfied with reliance on the stated legal considerations of international courts and tribunals, however, it turns to assess the root causes of such necessity, beneath pronouncements of legal sources and doctrine. The authors identify these as practicality – which speaks to what a court or tribunal must do to fulfil its mandate today – and legitimacy, which speaks to what it should do to ensure that its mandate is respected tomorrow.