Zero Trust rollout without breaking production

A Zero Trust rollout fails most often when it's treated as a single cutover event. The safer path is staged: identity and device posture first, then network segmentation, then policy enforcement.

Running new policies in monitor-only mode before enforcement catches the access patterns nobody documented but everybody depends on.

Plan for a parallel-run period — this is where most of the real risk gets surfaced and resolved before it becomes an outage.