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 activitiesisstill one of the major challenges of modern corporatemanagement. For many years, itwas 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 threelinesmodel was published in 2020as a fundamental update by theInstitute of Internal Auditors(IIA). This article presents thenew model and criticallydiscusses the similarities and differences to the existing model. Thus, this article contributes to the current discussion of best practices regardingcorporate governance structure and the fundamental issues of efficient and effective oversight. Both practitioners and researchers should benefit from the critical analysis of this paper.


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