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ISACA Certified Information Systems Auditor · Isaca
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Modular changeover involves replacing components of the old system in modules or sections, allowing new and old technologies to coexist temporarily. This approach minimizes compatibility issues because it allows time to test and integrate each module individually, reducing the risk of full system failure during the transition. Why not the others? A. Pilot operation A pilot is limited to a specific group or department. While useful for testing, it doesn’t address system compatibility broadly. B. Parallel changeover Running both systems simultaneously can be very resource-intensive and is often impractical when the systems are technologically incompatible. D. Phased operation Similar to modular, but often focused more on functions rather than integration issues. It may not address the risk of technological incompatibility as well as modular changeover does.
From ISACA CRM: parallel changeover. This technique includes running the old system, then running both the old and new systems in parallel, and, finally, fully changing over to the new system after gaining confidence in the working of the new system. With this approach, the users must use both systems during the period of overlap. This minimizes the risk of using the newer system.
According to ISACA's guidance, when transitioning to a new system that utilizes technologies incompatible with the old system, the MOST effective method to mitigate associated risks is B. Parallel changeover.