In system conversions, which method deploys a subset of the system first rather than the entire system at once?

Phased conversion is a method of system conversion that involves implementing the new system in stages or phases rather than all at once. In this approach, only a subset of the new system's functionalities or modules is deployed initially, allowing organizations to gradually transition from the old system to the new one. This staged implementation reduces risk by enabling users to adapt to the new system incrementally and allows for easier troubleshooting and adjustments based on user feedback before the entire system is rolled out.

This method contrasts with other conversion approaches. For instance, pilot conversion would involve deploying the entire system in a controlled environment or specific user group before full deployment. Rapid prototyping focuses on quickly creating a working model of a new system but does not specifically address the structured rollout of system functionalities. Parallel conversion maintains both the old and new systems simultaneously for a period, ensuring that any discrepancies can be resolved before fully phasing out the old system, which is different from the incremental approach of phased conversion.