A combination of audit test plans should be used to verify conformity to the standard requirements?

Using a combination of audit test plans is essential for verifying conformity to the standard requirements of ISO/IEC 27001. This approach allows auditors to gather comprehensive evidence through various methods, such as interviews, document reviews, and on-site observations. Each test plan can target specific aspects of the Information Security Management System (ISMS), ensuring that all relevant controls and processes are assessed effectively.

The rationale behind this practice lies in the complexity and multidimensional nature of information security management. Relying on a single audit method may not provide a complete picture of compliance or identify all potential gaps in an organization’s ISMS. A combination of approaches enhances the robustness of the audit results, providing a more thorough evaluation of how well the organization adheres to the standard's requirements and effectively manages its information security risks.

Therefore, employing a combination of audit test plans not only validates conformity but also strengthens the audit process, allowing for more informed decision-making and continuous improvement within the organization’s information security framework.