While helpful, a trial run of the full audit is not a standard requirement for virtual audits.

ISO/IEC 17021-1:2015 Clause 9.2.3.1 requires virtual audit feasibility to be confirmed in advance — including connectivity, security, and data access — but trial runs are optional, not mandated.

ISO 19011:2018 Clause 6.4.5 adds that “pre-audit assessments and contingency planning must be conducted for remote audits to ensure audit reliability.”