Which statement describes a potential parallel-method advantage?

Which statement describes a potential parallel-method advantage?

• A. if a problem arises, users can return to use the old system
• B. the new system is cheaper to implement
• C. the new system is available immediately
• D. the outputs from old and new system can be compared

Answer: (A)

When you roll out a system in parallel, the old and new systems run at the same time. The main advantage is safety: if something goes wrong with the new system, you can switch users back to the old one quickly, keeping the business running with minimal disruption. This fallback option is the strongest reason to use a parallel approach during implementation and testing. While it’s useful to be able to compare outputs from both systems to validate behavior, that’s a secondary benefit. Parallel rollout often costs more and isn’t instantly available—the new system isn’t automatically ready to replace the old one, and the old system still needs to be kept running for the switch.

When you roll out a system in parallel, the old and new systems run at the same time. The main advantage is safety: if something goes wrong with the new system, you can switch users back to the old one quickly, keeping the business running with minimal disruption. This fallback option is the strongest reason to use a parallel approach during implementation and testing.

While it’s useful to be able to compare outputs from both systems to validate behavior, that’s a secondary benefit. Parallel rollout often costs more and isn’t instantly available—the new system isn’t automatically ready to replace the old one, and the old system still needs to be kept running for the switch.