what traditional process does Cyber PHA follow given this information?

The Cyber PHA methodology reconciles the process safety and cybersecurity approaches and allows IT, Operations and Engineering to collaborate in way that is already familiar to facility operations management and personnel. Modeled on the process safety PHA/HAZOP methodology, a cyber PHA enables cyber risks to be identified and analyzed in the same manner as any other process risk, and, because it can be conducted as a separate follow-on activity to a traditional HAZOP it can be used in both existing brownfield sites and newly constructed greenfield sites without unduly meddling with well established process safety processes.[1]

HAZOP