Advantages: low risk, supports comparison of results, old system is there as backup should there be a problem, changeover happens gradually, staff have time to familiarise themselves with new system, Disadvantages: high cost, time-consuming, duplication of resources for a period of time, duplicate sets of data must be kept, systems are not always in synch,

Parallel Changeover #3

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排行榜

視覺風格

選項

切換範本

恢復自動保存: ?