Write notes on the following : (a) Parallel testing

Parallel testing is performed by system testing team. In Parallel Tests, the same test data is used in the new and old system and the output results are then compared. The system is tested and a copy of the live data e.g. share transfers effected during the last 6 months, the results of the share transfers are already available in the live environment as either a manual system or another computer system is in existence. When the same data is fed into the new system, the results obtained should be compared to ensure accuracy. As the same data is run on two systems one new and another existing, it is called parallel testing.