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Department of Homeland Security – Configuring and Managing Remote Access for Industrial Control Systems     3.7 3.7.5 3.7.6

https://www.cisa.gov/sites/default/files/recommended_practices/RP_Managing_Remote_Access_S508NC.pdf

From the Department of Homeland Security, these are recommended practices for configuring and managing remote access for control systems covering various roles including vendors, field technicians, business partners (all of which may have differing requirements.)

NIST SP 800-53: MA-5 Maintenance Personnel     3.7 3.7.2 3.7.5 3.7.6 Maintenance

https://nvd.nist.gov/800-53/Rev4/control/MA-5

The organization: a. Establishes a process for maintenance personnel authorization and maintains a list of authorized maintenance organizations or personnel; b. Ensures that non-escorted personnel performing maintenance on the information system have required access authorizations; and c. Designates organizational personnel with required access authorizations and technical competence to supervise the maintenance activities of personnel who do not possess the required access authorizations.