In light of increased pressure on multilateral institutions, this article assesses the contribution of international organizations (IOs) to shaping international law. For that purpose, it analyses the recent work of the International Law Commission (ILC) regarding the role of IOs and its reception by States. The article argues that States do not perceive IOs as a relic of bygone times. Instead, the sceptical attitude of some States seems to be based primarily on a lack of conceptual clarity with regard to IO practice. Yet, a changing geopolitical landscape increases the pressure on lawyers to explain firstly, that the relevance of IO practice finds support in international law (and not only in favourable power relations), and secondly, that the law provides means to integrate a more plural international order within a common framework. On that basis, the article sketches possible approaches to four issues which were left open by the ILC.

鉴于多边机构面临越来越大的压力，本文评估了国际组织 (IO) 对塑造国际法的贡献。为此目的，它分析了国际法委员会（ILC）最近关于 IO 的作用及其在各国的接受度方面的工作。文章认为，各国并不认为 IO 是过去时代的遗物。相反，一些国家的怀疑态度似乎主要是基于 IO 实践的概念不明确。然而，不断变化的地缘政治格局增加了律师的压力，他们首先要解释，IO 实践的相关性在国际法中得到支持（而不仅仅是在有利的权力关系中），其次，法律提供了整合更加多元化的国际的手段。在一个共同的框架内进行排序。