What is the difference between parallel installation and plunge installation?
What will be an ideal response?
With parallel installation, the new system/business process runs in parallel with the old one until the new system is tested and fully operational. Parallel installation is expensive, because the organization incurs the costs of running both existing and new systems/business process. Users must work double-time to run both systems. Then, considerable work is needed to reconcile results of the new with the old.
With plunge installation, the organization shuts off the old system/business process and starts the new one. If the new system/process fails, the organization is in trouble. Nothing can be done until either the new system/process is fixed or the old system/process is reinstalled. Because of the risk, organizations should avoid this conversion style if possible. The one exception is if the new system is providing a new capability that will not disrupt the operation of the organization if it fails.
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