Define the operating boundary
A useful definition names the triggering event, required inputs, governing source, accountable owner, decision or action, exception path, evidence retained, and downstream handoff. Buyers should adapt those elements to their own population, jurisdictions, policies, systems, and control model before writing requirements.
The most important distinction is between a label and an operational capability. A provider may document topology, communication, and dependency mapping while depending on customer-supplied policy, licensed content, third-party data, integration partners, manual review, or services. The demonstration should expose those dependencies rather than hiding them behind a completed interface.
What a demonstration should prove
- Begin with representative source records and a named policy, standard, or controlled rule.
- Show the normal path, an ambiguous case, missing data, an exception, an override, and a material source change.
- Identify who can change rules, who can approve or reject, and how accountability is preserved.
- Trace every output back to inputs, versions, timestamps, user actions, and governing evidence.
- Export the resulting record and reconcile it with downstream systems and retained obligations.
Authority and operating context
NIST SP 800-82 Rev. 3
NIST describes OT topologies, threats, vulnerabilities, safeguards, and risk-management considerations while recognizing performance, reliability, and safety requirements. Provider and architecture claims can be tested against a mature OT-specific control context without pretending the guide certifies a product or environment.
ISA/IEC 62443-3-2
Part 3-2 addresses system-level risk assessment and the use of zones, conduits, and target security levels in IACS design. It provides the central architecture language for comparing discovery, segmentation modeling, enforcement, remote access, and controlled-transfer products.
Joint OT asset inventory guidance
The joint guide describes a regularly updated OT asset inventory and taxonomy tied to function and criticality as a foundation for risk, vulnerability, architecture, and incident-response work. It raises the evaluation bar from device counts to governed identity, taxonomy, criticality, ownership, dependency, lifecycle, and use across operating functions.
CISA primary OT mitigations
The fact sheet calls attention to exposed OT connectivity and prioritizes defensive actions for owners and operators facing intentional targeting. It makes internet exposure, remote access, credentials, segmentation, inventory, logging, and recovery evidence central to product and architecture review.
NERC CIP-015-1
CIP-015-1 requires documented processes for internal network security monitoring of specified high- and medium-impact BES cyber-system environments, including data feeds, anomaly detection, evaluation, and evidence. The standard creates a concrete evidence and operating-model test for network telemetry, anomaly detection, evaluation, escalation, and record retention.
Operating domains
Asset inventory, context, and lifecycle
The maintained operating record for each OT asset's identity, role, location, owner, criticality, communications, dependencies, versions, configuration, support state, exposure, and recovery relevance.
Network architecture, segmentation, and conduits
The design and maintained evidence for security zones, conduits, trust boundaries, routable paths, industrial DMZs, enforcement points, fail states, and allowed communication supporting physical operations.
Evidence and comparison limits
Official provider documentation can establish product positioning. Provider confirmation can clarify package or availability. Independent observation requires a disclosed scenario, environment, date, inputs, and reproducible result. None of those sources alone establishes buyer-specific legal, clinical, regulatory, quality, or operational fitness.
Buyer questions
- What exact outcome and evidence should topology, communication, and dependency mapping produce?
- Which source, version, and customer facts govern the workflow?
- Which decisions remain human and who is accountable for them?
- What is native, configured, integrated, service-delivered, or planned?
- How does a changed source affect open and historical records?
Recent changes
IEC publishes PAS 62443-1-6:2025 — IIoT reviews need explicit device, gateway, edge, cloud, identity, data, update, supplier, and owner responsibilities.
CISA partners release OT asset inventory guidance — Product evaluation should test collection coverage, identity, context, criticality, confidence, ownership, lifecycle, and safe use rather than device counts.
CISA partners publish primary mitigations for OT — Owners should review exposure, access, architecture, credentials, monitoring, and recovery through site-authorized engineering processes.