What is a defining feature of the big bang changeover?

What is a defining feature of the big bang changeover?

• A. the company immediately starts using the new system
• B. the outputs from the old and new system can be compared to check that the new system is working correctly
• C. parts of the new system are implemented one at a time to allow users to get used to that one particular process
• D. the old system is kept online to test the new system

Answer: (A)

Big bang changeover means switching from the old system to the new one in a single, all-at-once go. The defining feature is that after the switch, the company immediately uses the new system and the old system is no longer in use. This approach carries more risk because any problems affect the whole operation right away, but it avoids the overhead of running two systems in parallel or in stages. The other scenarios describe phased or parallel approaches, where the new system is introduced gradually or run alongside the old one for testing, which is why they’re not defining features of a big bang changeover.

Big bang changeover means switching from the old system to the new one in a single, all-at-once go. The defining feature is that after the switch, the company immediately uses the new system and the old system is no longer in use. This approach carries more risk because any problems affect the whole operation right away, but it avoids the overhead of running two systems in parallel or in stages. The other scenarios describe phased or parallel approaches, where the new system is introduced gradually or run alongside the old one for testing, which is why they’re not defining features of a big bang changeover.