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A requirement that the old system must be operational until the new system is completed is classified as a transition requirement. Transition requirements are vital during the period of change from the old system to the new one, ensuring that there is no disruption in service and that the business can continue to operate smoothly through the transition phase. They focus on managing the transition process effectively, including ensuring existing functionalities remain available until the new system is fully implemented and verified.

The other types of requirements are differentiated by their specific characteristics. One-time requirements typically refer to requirements that are only needed for a specific event or activity, which do not align with the ongoing need for operational continuity. Cutover requirements can be seen as closely related but specifically involve the details of how the transition occurs, making them more focused on the actual transfer process rather than the operational necessity of the old system. Change requirements relate to modifications needed in response to evolving business needs but do not address the operational continuity between systems during a transition.