Corporate governance has received increased attention from both regulators and researchers in recent years resulting in highlighting the significance of the internal audit function (IAF). Another transformative force on the IAF has been the dissemination of enterprise resource planning (ERP) systems which have an impact on the legitimacy of the IAF if it is not suitably adapted. However, there is insufficient knowledge about the adaptations of the IAF which are required if it is to maintain its essential role in governance. This book extends our knowledge by exploring and theorising the adaptation of the IAF after ERP introduction. This book uses institutional theory as a lens through which to investigate how the IAF responds to the external governance pressures and the internal pressures of the control logic following the introduction of an ERP system. Data were gathered from two listed companies in the food and beverage sector and two large banks operating in Egypt, where one of each pair is an international company and the other is a national company. Interviews and focus groups were conducted with all stakeholders in addition to careful analysis of a number of internal and external documents related to the ERP and the IAF.