Controls only count if they hold under pressure and under audit. Phase 3 tests what you've built, keeps documentation current, and proves your team can respond when something goes wrong.
A gap analysis is only useful if someone closes the gaps. Phase 2 turns assessment findings into a written Cybersecurity Plan and implements the controls behind it, sequenced around your production windows.
You can't secure what you haven't inventoried. Phase 1 designates your Cybersecurity Officer, maps your OT assets, and completes the site-specific assessment the rule requires.
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