This guide explains how organizations can introduce zero trust into operational technology without disrupting production or safety. Teams must identify barriers created by automation vendors, system integrators, warranties, and legacy architectures. Compatibility assessments should account for industrial systems with long life cycles, static addresses, limited interfaces, and headless devices. Static passwords and disconnected credential practices may require modernization through Active Directory, privileged access management, and multifactor authentication. Organizations must verify whether OT protocols, controllers, and human-machine interfaces can support continuous verification. Safety functions and time-sensitive operations should never be delayed by access controls. Finally, busines

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