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

Utilizing a combination of audit test plans is essential for effectively verifying conformity to standard requirements, such as those outlined in ISO/IEC 27001. This approach allows for a comprehensive assessment of the Information Security Management System (ISMS), ensuring that various facets of the system are evaluated against established criteria.

In audit practice, relying on a single type of test plan may not provide a complete or accurate picture of compliance. Different test plans can address various aspects of the standard, such as document management, risk assessment, control implementation, and incident response. By employing a diverse set of tests, auditors can cover a wider range of scenarios and controls, ultimately leading to a more rigorous analysis of how well the organization aligns with ISO/IEC 27001 requirements.

This strategy enhances the reliability of the audit findings, offering stakeholders greater confidence in the organization's adherence to information security principles and practices. It also helps identify potential areas for improvement that might not be captured with a singular focus. Thus, the use of multiple audit test plans is a fundamental component of a thorough audit process and is aligned with best practices in auditing and compliance assessment.