Audit methods can be either with or without interaction with individuals representing the auditee.

According to the PECB Candidate Handbook for ISO/IEC 27001 Lead Auditor, audit methods can be classified into two categories: with or without interaction with individuals representing the auditee (page 12). Audit methods with interaction include reviewing checklists with auditee and conducting interviews, as they involve direct communication and feedback from the auditee. Audit methods without interaction include sampling (e.g. products), observing work performed via live video streaming, checking legal compliance with local authorities, and analysing documents provided in advance of the audit, as they do not require any dialogue or exchange with the auditee. References: PECB Candidate Handbook for ISO/IEC 27001 Lead Auditor, page 12.