The conclusion of the book briefly reappraises the main findings of the previous chapters. It argues that a study of the foundations of due diligence from the dogmatic perspective of obligations serves both a cognitive and a normative function. First, the conclusion argues that the theoretical reconstruction of due diligence undertaken by the book has helped to overcome their elusiveness and to better understand the nature of due diligence obligations and how they are operationalised in practice. Second, the conclusion argues that construing due diligence as an identifier for a certain class of primary rules supplies a normative function, as it allows normative considerations to be made about how state responsibility for the violation of these rules accrues.