Which system changeover method would you recommend for an air traffic control system upgrade? Explain your answer.
What will be an ideal response?
The one technique that would definitely not be used is the direct cutover: the risks of failure for a life-critical system like air traffic control is too high.
The pilot operation method is also probably not a good choice, as air traffic control systems are tightly integrated across multiple sites.
The parallel operation method is probably the best option if the entire system was being replaced. After the new system has shown to be at least functionally equivalent, the older system could be retired.
If the new system would be developed in stages, with enhanced functionality being realized in discrete modules, the phased operation method could be used.
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