Guide | 6 min read
How to prepare for an OT cybersecurity assessment
A practical guide to preparing drawings, asset records, remote access information and operational context before an OT cybersecurity assessment.
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Start with the system boundary
A useful assessment starts by defining what is in scope. For OT environments this usually means identifying the control system, connected engineering assets, vendor access paths, historian or reporting links, and any corporate or cloud interfaces that influence the risk picture.
The boundary does not need to be perfect before work starts, but it should be clear enough for operations, engineering and cybersecurity teams to discuss the same environment.
Gather practical engineering evidence
Assessment quality depends heavily on the available evidence. Drawings, switch schedules, IP address records, firewall exports, asset lists, backup records and remote access procedures all help reduce uncertainty.
Where records are incomplete, that should be treated as a finding in its own right rather than hidden behind assumptions.
Useful evidence
- network architecture drawings
- asset and interface registers
- remote access routes and account ownership
- backup and recovery arrangements
- supplier support responsibilities
Keep operational constraints visible
OT assessment recommendations should account for uptime, safety context, maintenance windows, supplier dependency and the support model for legacy assets.
The aim is not to produce a generic control list, but to identify risk reduction measures that can be planned and evidenced in a live industrial environment.
Related services and problems
Continue through related service, problem and resource pages for the same OT cybersecurity topic.
Discuss practical OT cybersecurity evidence
Use a technical discovery call to frame the system boundary, known constraints and the evidence needed before sharing sensitive site details.