During changeover, a new system and an existing system run side by side. To input the same data and perform the same processes, compare their output and prove the reliability of the new system. If the new system is accepted, the existing system will stop running and will be replaced by the new one.
The practical example of parallel running in human resource management is job placement. A new staff and an old staff work for the same job. If the new staff's performance is OK, the existing staff may not be needed any more, and will be replaced. This is different from direct changeover and phased implementation because parallel running requires two systems working at the same time.
- Wainwright, Stewart (2009). IGSCE and O level Computer Studies and Information Technology. Cambridge. p. 29.
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