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Parallel running is one of the ways to change from an existing system to a new one. This conversion takes place as the technology of the old system is outdated so a new system is needed to be installed to replace the old one.〔 The phrase parallel running can refer to the process of changing a fragment of business information technology operation to a new system or to the technique applied by the human resources departments in which the existing staff stay on board during the transition to a new staff. It is one of the strategies for system implementation in which both the old and new systems are running side by side until the users are certain that the new system has no problems.After a period of time, when the system is proved to be working correctly, the old system will be removed completely and users will depend solely on the new system. ==Overview== New system needs to be implemented once it has been built and tested so that it is carrying out the jobs according to the objectives. This involves a few initial steps which are: 〔〔 *ensuring the correct hardware and software have been prepared; Any additional hardware and software must be prepared and stored until they are implemented. Before setting up the hardware and software, they need to be checked against any errors *arranging training of staff in using the new system; This includes those who will operate the new system and those who will support others in the initial phases of implementation such as Network Administrator and managers. *inputting data; Data need to be input to the data files in the new system either manually or by downloading them from the old system. To implement the new system, a parallel running strategy can be applied in which the new system is run alongside the old system for a specified time. Parallel running is different from the term parallel processing. There are also other possible strategies that can be used for implementation of the new system. All of the implementation strategies come with their own advantages and disadvantages. So, it depends on the requirement of the organisation to choose which implementation strategy they want to apply. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「parallel running」の詳細全文を読む スポンサード リンク
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