Answer / ramyab.mca@gmail.com

Hai....

Testing a new or an altered data processing system with the
same source data that is used in another system. The other
system is considered as the standard of comparison. OR we
can say that parallel testing requires the same input data
be run through two versions of the same application.
Parallel testing should be used when there is uncertainty
regarding the correctness of processing of the new
application. And old and new versions of the applications
are same.
E.g.-
1) Operate the old and new version of the payroll system to
determine that the paychecks from both systems are
reconcilable.
2) Run the old version of the application system to ensure
that the operational status of the old system has been
maintained in the event that problems are encountered in
the new application.

Thanks & Regards
B.Ramyasri

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