The operational phase is the point in a security program or legal requirement where rules stop being policy text and become daily practice. At this stage, an organization must show that controls are actually used: staff follow procedures, managers enforce them, records are kept, and exceptions are handled through a defined process.
In cyber security, this matters because many failures happen not in design, but in execution. Attackers exploit gaps between written policy and real behavior, such as skipped approvals, weak escalation, or training that is never reinforced. Defenders use the operational phase to test whether controls are repeatable and measurable through audits, logs, tabletop exercises, and routine reviews. If a safeguard cannot survive normal work pressure, it is not truly operational.