Both old and new systems run ____ for a period. It is a low risk method but it can be ____ as workload and resources are ____ as two systems are running at the same time. An advantage of this method is that users can get used to the new system ____ and it supports ____ of results with old and new systems. Changeover can take place over a period of time and the old system is there as a ____ should the new system have ____. Disadvantages of this method are that it is more expensive as two systems are running simultaneously and that two ____ sets of data are being kept which may not always be ____ It is best suited to ____ systems with ____ should the changeover ____ or for ____ where no downtime can be allowed.

Parallel Changeover #1

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