A recent CISA guidance document titled "Foundations for OT Cybersecurity: Asset Inventory Guidance for Owners and Operators" underscores the importance of constructing and maintaining comprehensive asset inventories and taxonomies within OT (Operational Technology) environments. Published on August 13, 2025, the guide outlines practical steps for OT owners and operators in critical infrastructure sectors: scoping their systems, cataloging assets with relevant details, organizing them into taxonomic groups, and managing their lifecycles to improve resilience, continuity, and security oversight.

Crucially, CISA cites the ISA/IEC 62443 standard series as the authoritative source for developing effective OT asset inventory taxonomies. This reference highlights the global trust and widespread adoption of ISA/IEC 62443 across industries, reinforcing its role in shaping cybersecurity frameworks for industrial systems. By aligning guidance with these internationally recognized standards, the document strengthens the foundation for secure, standardized OT architectures.

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Source: https://gca.isa.org/blog/isa-iec-62443-cited-in-cisa-ot-cybersecurity-guidance