I think pilot changeover is about testing the new system on a small scale first, but I'm not entirely sure if it involves the simplest part of the business.
I feel pretty confident about this one. The descriptions of the changeover methods seem clear, and I think I have a good handle on the differences between them.
Okay, let's see. I think the key is to focus on the three methods mentioned - pilot, parallel, and phased. The question is asking which of these are true, so I'll need to carefully review the details of each.
C) All methods of changeover carry high risk and it is the preparation consideration of data compatibility and data cleansing before the changeover which has the biggest impact on the smoothness of the transition
B) Parallel running involves keeping the old system running normally until certain data retention criteria are met or confidence is gained, while the new system deals with the new workload Data input is usually earned out on both systems
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