Exam CISA topic 1 question 519 discussion

The answer is B because it allows users to compare the outputs to ensure that the new system performs accurately and reliably before fully transitioning. Parallel processing it allows for immediate verification of data integrity and system functionality, which is crucial in complex ERP environments. I feel the key work here is 'data migration' and not development of the complex ERP system. In the case of development, i would choose C as the best approach would be to implement the system in stages.

Parallel processing (option B) involves running both the old and new systems simultaneously for a period, which can be resource-intensive and complex. It requires synchronization of data between systems and can lead to confusion if discrepancies arise between the old and new systems. Therefore, phased changeover is generally considered the BEST approach for ensuring assurance and user confidence when migrating data to a more complex ERP system.

Answer: C option A&B may not provide the same level of assurance and user confidence as phased changeover in the context of migrating to a more complex ERP system.

A is correct.

I'm going with B. Key word is "Assurance" UAT does not provide assurance although it may help with gaining user confidence.

should be A

UAT could be the most appropriate answer as the question is about most confidence.. so A