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What type of conversion approach gives the highest amount of redundancy?
Pilot study
Parallel run
Direct cutover
Phased approach
Parallel runs are the safestthough the most expensiveapproach, because both the old and new systems are run, thus incurring what might appear to be double costs. Direct cutover is actually quite risky, since it does not provide for a shake down period nor does it provide an easy fallback option. Both a pilot study and a phased approach are performed incrementally, making rollback procedures difficult to execute.
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