Both the old system and its potential replacement are run together for a time until everyone is assuring that the new one functions correctly. This is the safest conversion approach because, in the event of errors or processing disruptions, the old system can still be used as a backup. But, this approach is very expensive, and additional staff or resources may be required to run the extra system.
Kavungya answered the question on May 10, 2019 at 14:17
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