Which conversion method sees the old system fully operational until the new system is ready for complete transition?

The method in which the old system remains fully operational until the new system is ready for a complete transition is known as parallel conversion. In this approach, both systems operate simultaneously for a period of time, allowing users to become accustomed to the new system while still relying on the old system for essential functions. This strategy minimizes risk and ensures that if any issues arise with the new system, the organization can still depend on the old system to maintain operations.

By running both systems concurrently, organizations can thoroughly test the new system with real data and user interactions without disrupting their existing processes. Once the new system is confirmed to be stable and functioning as expected, the old system can be phased out confidently, ensuring a smoother transition overall. This mitigates risks associated with system failures, providing a safety net during the transition period.

Other methods, such as direct conversion or phased conversion, do not maintain the old system operation during the entire transition period, which can expose organizations to greater risks of disruptions or system failures if any problems arise with the new system.