WJEC Digital Technology Practice Test 2026 - Free Digital Technology Practice Questions and Study Guide

Phased change means rolling out the new system gradually, introducing only one part at a time so users can learn and adapt to that specific process before the next part is added. This approach helps manage risk—if a problem arises, it affects only a small portion rather than the entire system—and lets support teams focus on one area at a time, making training and adjustments easier. The option that describes implementing the new system piece by piece to help users get used to that particular process captures this idea. The other options describe different approaches: comparing outputs is a form of validation or parallel testing, replacing the old system all at once is a big-bang rollout, and testing after rollout is about post-implementation validation rather than the staged rollout itself.