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The New Three Lines Model for Structuring Corporate Governance – A Critical Discussion of Similarities and Differences

The efficient and effective organization and coordination of corporate governance activities is still one of the major challenges of modern corporate management. For many years, it was precisely the so-called three lines of defense model that was used to structure governance functions. However, as more and more open points of discussion regarding practical implementation have emerged over the past years, the three lines model was published in 2020 as a fundamental update by the Institute of Internal Auditors (IIA). This article presents the new model and critically discusses the similarities and differences to the existing model. Thus, this article contributes to the current discussion of best practices regarding corporate governance structure and the fundamental issues of efficient and effective oversight. Both practitioners and researchers should benefit from the critical analysis of this paper.