What ensures that all relevant evidence is gathered during an audit?

Utilizing a comprehensive checklist is key to ensuring that all relevant evidence is gathered during an audit because it provides a structured approach to the audit process. A checklist ensures that auditors systematically cover all critical areas, including policies, procedures, controls, and any other documentation relevant to the information security management system. This structured method helps to minimize oversight and ensures that important evidence is not missed, facilitating a thorough evaluation of the organization's compliance with ISO/IEC 27001 standards.

Additionally, checklists often include specific criteria and questions that guide auditors in their investigation, allowing them to probe deeper into particular issues or areas of concern. They can also serve as a reference for verifying that all needed documentation has been reviewed, interviews conducted, and observations made, thereby leading to a more comprehensive and objective assessment.

In contrast, interviewing all staff members or setting a time limit might lead to inconsistencies and gaps in the evidence collected, as they do not guarantee a thorough examination of all relevant aspects. Relying solely on documented sources can overlook practical insights and contextual understanding that might come from direct interactions or observations, which is also important for a well-rounded audit outcome.