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Risk and control of Information Systems

Changeover methods

5.1 Changeover methods

 Direct Old system switched off and new system switched on

Cheap but risky

 Parallel Old and new systems run together for some time, until it is
felt safe to switch off the old.

Costly (duplication) but less risky

 Pilot One part of the business changes over first and then plans
rolled out to the rest of the business

Should reduce some risks as can learn from the pilot but
other locations may have different issues / problems

 Phased Introduce new system one part of the business at a time

Less risky but takes longer

Illustrations and further practice

Now try TYU 6 to 8 from Chapter 4

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