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CISA Practice Question: Replacing its legacy on-premises ERP system with…
A company is replacing its legacy on-premises ERP system with a cloud-based SaaS solution. The project manager is concerned about data migration risks. Which of the following is the BEST approach to mitigate data integrity issues during migration?
⚠ Common exam trap
It's easy for candidates to choose post-migration validation or reconciliation (options A or C) because they seem practical, but the CISA exam emphasizes proactive controls during migration (parallel processing) over detective controls after the fact.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Run parallel processing and compare outputs
Running parallel processing allows the legacy and new SaaS systems to operate simultaneously, enabling real-time comparison of outputs. This approach directly validates data integrity by detecting discrepancies during migration, not after, which is critical for ERP systems where transactional accuracy is paramount.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Perform data validation after migration
Why it's wrong here
This is reactive, not proactive.
- ✗
Use data transformation tools to convert formats
Why it's wrong here
This addresses format, not integrity.
- ✗
Implement data reconciliation reports post-migration
Why it's wrong here
Detects issues after the fact.
- ✓
Run parallel processing and compare outputs
Why this is correct
Enables side-by-side verification.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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