The Law of Treaties

This chapter applies the dual legal nature to the law of treaties. It begins by describing how international organizations were conceptualized in the debates of the International Law Commission and of International Law Institute on the law of treaties. Afterwards it contends that the capacity of an international organization to conclude a treaty is based both on a norm of general international law and on a norm of the internal institutional legal system. This finding is applied to the controversial issue of the position of member states in the treaty concluded by the organization. The dual nature leads to rethinking the role of members within the organizations based on complementarity. It means that member states have an indirect involvement with the treaty concluded only by the organization. For instance, member states’ obligations arise in order to provide the organization with the means to fulfil the obligations of the organization.