The 'worst case scenario' might be that when implementing a new system (using the direct cut-over)that the new system doesn't work and the old system has been decommissioned.

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This is the risk of implementing the direct cut-over method, where the switch to the new system is sudden and does not allow for a transition period. If the new system fails, there may be no way to quickly revert back to the old system, resulting in significant disruption and loss of productivity.

The 'Worst Case Scenario' Might Be That When Implementing a New