Begin with interviews, existing diagrams, configuration records and approved passive evidence. Engineering and operations identify fragile systems, maintenance windows, stop-work contacts and recovery requirements.
Active testing requires explicit authorization for the system, technique, timing and operating conditions. A laboratory or representative asset may be the appropriate place to validate a concern. Excluded and untested areas remain visible in the report. Safeguards reduce risk; they do not guarantee that disruption is impossible.
The scope identifies any electrical, protection, process-control, OEM or integrator expertise the work needs. A general cybersecurity assessment does not authorize changes to plant logic, protection settings or live equipment.