# Is it possible to transition step by step and work in two systems for some time?
# Question

Is it possible to transition step by step and work in two systems for some time?

# Answer

![Scheme of phased migration to Swarmica: the previous system continues to operate while configuration, test transfer, verification, and channel switching are performed.](https://support.swarmica.com/attachments/h/2/h2z43T8x3EFTeRVR_a/phased-migration.png "Phased migration to Swarmica")

*Scheme: the current system continues to accept requests → Swarmica is configured and receives data → the result is verified → channels are switched.*

Yes. During the preparation phase, the previous system continues to accept requests, while Swarmica is configured and receives data in the background. Before switching, a test transfer can be performed, field mapping can be corrected, and changes can be retrieved again if the source technically allows it.

The final plan determines the moment of channel switching, the last export, result verification, and the order of actions in case of an error. The final launch is performed only after confirmation of readiness.

**Details:** [Phased migration](https://swarmica.ru/migration)