According to IIA guidance, an engagement work program is designed to test the effectiveness of process controls within an organizational process. This involves evaluating whether the controls are adequately designed and operating effectively to mitigate identified risks and achieve the process objectives. The work program outlines the specific procedures and steps auditors will take to gather evidence and assess the controls in place, ensuring that they address the relevant risks and comply with the organization's standards and policies.
Reference:
IIA Standard 2240: Engagement Work Program
IIA Practice Guide: Internal Audit Quality Assurance