Determine the technique - parallel, Software Engineering

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Determine the technique - Parallel

With this approach, old and new systems are run together for a time

 -  If new system goes down for any reason, you still have old system to fall back on so a failure wouldn't be disastrous

-  It's possible to gradually train staff/time to get used to new system  

-  More expensive than direct since need extra staff to run both systems

-  More time consuming as both systems need to be run and evaluated

 

 


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