When planning to audit an outsourced function, the most appropriate first step for an internal auditor is to understand the objectives and strategies of the new arrangement. This step is crucial because it sets the foundation for the entire audit process. By understanding the objectives and strategies, the auditor gains insights into the rationale behind the outsourcing decision, the expected outcomes, and how these align with the organization's overall goals. This understanding helps in identifying key risks, establishing relevant audit criteria, and tailoring the audit scope and procedures accordingly. Without this initial step, the auditor may miss critical aspects of the outsourced arrangement, leading to an incomplete or ineffective audit.
Reference:
Institute of Internal Auditors (IIA) Practice Guide: "Auditing Outsourced Activities" COSO Enterprise Risk Management Framework