Phased Migration
Phased migration is a software development and IT strategy that involves transitioning from an old system to a new one in incremental stages or phases, rather than all at once. It allows for gradual implementation, testing, and validation of components, reducing risk and minimizing disruption to operations. This approach is commonly used in system upgrades, cloud migrations, database transitions, and application rewrites.
Developers should use phased migration when dealing with complex, mission-critical systems where a 'big bang' migration poses high risks of downtime, data loss, or performance issues. It is ideal for scenarios like moving legacy applications to the cloud, upgrading large-scale databases, or refactoring monolithic architectures into microservices, as it enables controlled rollouts, easier troubleshooting, and user adaptation over time.