CHAZOP (Control Hazard and Operability Study) identifies hazard and operability issues associated with control and computer systems. It follows the same methodology as HAZOP, however, using appropriate documents and Guidewords.
CHAZOP documentation requirements include: Control System Network Architecture Schematic, Cause & Effect Charts, Control / SIS Block Diagrams, ESD/ F&G interface & electrical protection schematics, Alarm / Signal List, Control Philosophy / Narratives