Parallel Testing

Usage:


• To ensure that the processing of new application (new version) is consistent with respect to the processing of previous application version.
  

Objective:


• Conducting redundant processing to ensure that the new version or application performs correctly.
• Demonstrating consistency and inconsistency between 2 versions of the application.

How to Use


• Same input data should be run through 2 versions of same application system.
• Parallel testing can be done with whole system or part of system (segment).

When to Use


• When there is uncertainty regarding correctness of processing of new application where the new and old version are similar.
• In financial applications like banking where there are many similar applications the processing can be verified for old and new version through parallel testing

Example


• Operating new and old version of a payroll system to determine that the paychecks from both systems are reconcilable.
• Running old version of application to ensure that the functions of old system are working fine with respect to the problems encountered in the new system.