When an internal auditor is asked to join a project team to help design controls in a software application, the most appropriate action is to advise the project team on how to develop effective controls. This advisory role ensures that the internal auditor provides expert guidance on control design without becoming directly responsible for implementation, maintaining their independence and objectivity. This approach allows the internal auditor to contribute valuable insights while ensuring that controls are properly integrated into the application.References:
* IIA Standard 2120: Risk Management
* IIA Practice Guide: Information Technology Controls

According to IIA guidance, elements of evaluation reflect a valid principle for the internal audit activity to rely on the work of internal or external assurance providers. This principle involves assessing the competence, objectivity, and performance of the assurance providers to ensure their work can be relied upon. Proper evaluation helps internal auditors determine the extent to which they can use the work of others in forming their conclusions.
Reference:
IIA Standards: 2050 - Coordination and Reliance
IIA Practice Guide: Reliance by Internal Audit on Other Assurance Providers

Section: Volume D

Section: Volume C