Due diligence is a frequently employed notion in international law, yet much is still to be explored about this concept. This article aims to contribute to an understanding of due diligence obligations in international law, which is useful as it can form the basis for a further clarification of corresponding legal rights of subjects of international law. With this purpose in mind, this article initiates the construction of a working model of due diligence in international law by exploring this notion from two perspectives: an accountability perspective and a regulatory perspective. Subsequently, this article will use this model to compare the operation of due diligence obligations in two branches of international law: international environmental law and international human rights law. In doing so, it will become clear that due diligence contains two core elements: ‘reasonableness’ and ‘good faith’. Moreover, it will become apparent that the operation of due diligence obligations in these two branches has implications for systemic issues in international law. Further research on the operation of due diligence obligations in other branches of international law is therefore recommended.

尽职调查是国际法中经常使用的概念，但是关于这一概念仍有很多探索。本文旨在促进对国际法中尽职调查义务的理解，这是有用的，因为它可以为进一步阐明国际法主体的相应法律权利奠定基础。出于这个目的，本文通过从两个角度探讨这一概念开始了国际法尽职调查工作模型的构建：问责制角度和监管角度。随后，本文将使用该模型来比较尽职调查义务在国际法两个分支中的运作：国际环境法和国际人权法。在这样做，显而易见，尽职调查包含两个核心要素：“合理性”和“诚信”。而且，很明显，这两个部门的尽职调查义务的运作对国际法中的系统性问题有影响。因此，建议进一步研究国际法其他分支机构中的尽职调查义务的运作。