Which of the following system and data conversion strategies provides the GREATEST redundancy?
A.
Direct cutover
B.
Pilot study
C.
Phased approach
D.
Parallel run
Explanation:
Parallel runs are the safest-though the most expensive-approach, 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.