Functionalism
Functionalism is conventionally considered the mainstream paradigm of the law of international organizations: organizations are agents of their member states by the means of a contractual relationship; the law created by international organizations is purely international law; the institutional veil is characterized by a crystallin transparency; the autonomy of the organization is minimal and only granted by a rigid conferral of competences and few implied powers; the conduct of member states acting in the institutional forum is relevant as a matter of international law. This chapter introduces the historical roots of this conceptualization and elaborates why under this perspective the rules of the organizations are purely international law. It describes the flaws of this theory, discussing the breach of institutional rules by the organization and the adoption of countermeasures against a wrongful act committed by a member state.