Domain I covers the purpose of Internal Audit. This domain focuses on the roles and responsibilities of internal auditors in evaluating and contributing to the effectiveness of governance processes, risk management, and internal control systems within an organization.

Domain II covers Ethics and Professionalism. This domain focuses on the standards related to the management of the internal audit activity within an organization. It covers the responsibilities of the chief audit executive (CAE) or the person responsible for the internal audit activity, as well as the overall administration and management of the internal audit function.