What does "direct changeover" involve?

Direct changeover involves shutting down the old system and immediately activating the new system, making it the sole operational system. This approach is characterized by its speed and simplicity, as it requires a complete switch from the old to the new system without any overlap or transitional phase.

This method is often chosen for its straightforward nature; however, it carries risks because if the new system encounters issues, there is no fallback option to the old system until it can be reactivated.

In this context, the other options describe different methods of system implementation. Sequentially implementing components of a new system refers to a phased approach, where parts of the new system are introduced one at a time. Running both systems concurrently for a brief period describes parallel changeover, allowing for a comparison and testing of the new system while still relying on the old one. Restarting an old system before shutting it down is not a recognized method of system changeover and does not accurately reflect any standard practice in system implementation.