Audit preparation: This stage involves defining the audit objectives, scope, criteria, and plan. The auditor also prepares the audit checklist, which is a list of questions or topics that will be covered during the audit. The audit checklist helps the auditor to ensure that all relevant aspects of the ISMS are addressed and that the audit evidence is collected in a systematic and consistent manner12.
Audit execution: This stage involves conducting the audit activities, such as opening meeting, interviews, observations, document review, and closing meeting. The auditor gathers objective evidence, which is any information that supports the audit findings and conclusions. Objective evidence can be qualitative or quantitative, and can be obtained from various sources, such as records, statements, physical objects, or observations123.
Audit reporting: This stage involves reviewing the audit evidence, evaluating the audit findings, and documenting the audit results. The auditor reviews the audit evidence to determine whether it is sufficient, reliable, and relevant to support the audit findings. The auditor evaluates the audit findings to determine the degree of conformity or nonconformity of the ISMS with the audit criteria. The auditor documents the audit results in an audit report, which is a formal record of the audit process and outcomes. The audit report typically includes the following elements123:
An introduction clarifying the scope, objectives, timing and extent of the work performed
An executive summary indicating the key findings, a brief analysis and a conclusion
The intended report recipients and, where appropriate, guidelines on classification and circulation
Detailed findings and analysis
Recommendations for improvement, where applicable
A statement of conformity or nonconformity with the audit criteria
Any limitations or exclusions of the audit scope or evidence
Any deviations from the audit plan or procedures
Any unresolved issues or disagreements between the auditor and the auditee
A list of references, abbreviations, and definitions used in the report
A list of appendices, such as audit plan, audit checklist, audit evidence, audit team members, etc.
Audit follow-up: This stage involves verifying the implementation and effectiveness of the corrective actions taken by the auditee to address the audit findings. The auditor monitors the progress and completion of the corrective actions, and evaluates their impact on the ISMS performance and conformity. The auditor may conduct a follow-up audit to verify the corrective actions on-site, or may rely on other methods, such as document review, remote interviews, or self-assessment by the auditee. The auditor documents the follow-up results and updates the audit report accordingly123.
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