PR.DS-7.1: The development and test environment(s) shall be isolated from the production environment.
Any change one wants to make to the ICT/OT environment should first be tested in an environment that is different and separate from the production environment (operational environment) before that change is effectively implemented . That way, the effect of those changes can be analysed and adjustments can be made without disrupting operational activities.
Consider adding and testing cybersecurity features as early as during development (secure development lifecycle principles).
Documentation Maturity
Implementation Maturity
Description
The development and test environment(s) shall be isolated from the production environment.