What is "parallel running" in system transitions?

Parallel running refers to the practice of operating both the old and new systems at the same time during a transition period. This approach allows organizations to compare the outputs and performance of both systems, ensuring that the new system is functioning correctly before fully retiring the old one. It provides a safety net, as users can continue to rely on the established system while verifying that the new system meets their needs and performs as expected.

This method helps to mitigate risks associated with transitioning to a new system, such as data loss or functionality issues, by allowing for real-time validation and adjustment of the new system based on feedback from its concurrent use with the old system. In contrast, the other options involve different strategies for implementing a system transition that may not provide the same level of security and validation during the shift.