Final answer:
In the parallel conversion approach, an organization can switch back to the old system if the new system fails, providing a safety net during transition.
Step-by-step explanation:
The organization can switch to the old system if the new system fails in the parallel conversion approach. In this method, both the old and new systems run simultaneously for a period of time. This strategy provides a safety net, allowing organizations to revert back to the old system without a significant disruption in operations should the new system encounter critical issues. The parallel conversion approach offers an extra layer of security, but it's also the most resource-intensive, requiring support for two systems at once. It is generally used in scenarios where the risks of immediately cutting over to the new system are deemed too high.