installation: direct change over


	installation: direct change over
	Advantages it allows the company to change the system when most convenient is the cheapest don't need to keep data duplicates	Disadvantages as the change is almost instantaneous this means that the staffs has very little time in order to train and get use to the new system nothing to fall back on there is a period of time when neither systems are operational
	Evaluation the old system is completely switched for the new one, this is the most risky but also straight forward

as the change is almost instantaneous this means that the staffs has very little time in order to train and get use to the new system
nothing to fall back on
there is a period of time when neither systems are operational

the old system is completely switched for the new one, this is the most risky but also straight forward

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