IEC61511-1:2016, § 3.2.87 defines functional safety verification as: confirmation by examination and provision of objective evidence that the requirements have been fulfilled.

Verification activities take place throughout the SLC to ensure systematic integrity. They consist of checking, review, inspection or testing activities as part of the normal engineering/construction/O&M quality process, however, with focus on functional safety. Verification activities are defined in the Project Functional Safety Plan (PFSP), including inputs, outputs, verification responsibility and timing.