Reply to post: Re: A better question

Software bug costs Citigroup $7m after legit transactions mistaken for test data for 15 years

Duncan Macdonald Silver badge

Re: A better question

Sometimes the only way to be certain that the production system actually performs in the same way as the development system is to exercise it with the same data. Without that check it is possible for the production system to have an unnoticed coding difference from the development system (Yes in theory this should never happen but in the real world it does happen that a patch fails to make it from development to production.) It is also possible that size differences between the development system and the production system can lead to errors (eg if there is a fixed size array that overflows) as in many companies the development/test systems are not as large as the production systems.

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