One disadvantage of phased rollout is that it can result in user experiences across different phases.

Phased conversion allows for a smoother from the old to the new system.

Direct changeover can be risky as any issues with the new system will immediately affect .

An important consideration in parallel running is the need for of data between the old and new systems.

During parallel running, both the old and new systems are simultaneously.

One advantage of phased rollout is that it allows for and identification of issues.

Direct changeover can lead to system failures.

A potential disadvantage of pilot running is the at which the new process can be tested.