Parallel Testing

Parallel Testing
Evaluating a software for any defects and discrepancies is the main aim of testing. It is only after rigorous tests that any software is declared fit for release. But, the vital point is that each and every test has to be performed in a sequence so that the results can be considered trustworthy. Haphazard testing is just a waste of everybody's time. In the series of tests that a software has to undergo, one type is known as Parallel Testing.

What Is Parallel Testing?

In the case of a new software, when two or more of its components are tested side-by-side, it is known as Parallel Testing. This type of testing is usually done to check the functional characteristics of a software. Each functional characteristic is tested on an individual PC simultaneously.

In the case of a software that is being upgraded, Parallel Testing is the technique where the same data is entered simultaneously in the current version and the upgraded version in order to find defects and rectify them.

Advantages Of Parallel Testing

The various advantages of Parallel Testing have been enumerated below:

  • Ensures Software Integrity – the test results point out the areas of improvement in the form of errors or anomalies. Since each functionality is tested, it makes for the integrity of the software.
  • Saves Time – when tests are run parallel to each other, it results in tremendous time saving. Often when there is a time crunch or a fast approaching deadline, it is more advisable to conduct Parallel Testing.
  • Allows Comparing Of Results – the most important advantage of Parallel Testing is that it allows comparison of results. This is especially effective when a newer version of the software is being introduced. Comparison of results between the current version and the new improved version makes for a better and improved software.

Disadvantages Of Parallel Testing

The cons of Parallel Testing include:

  • Expensive Due To Replicating Resources – Parallel Testing calls for replicating expensive equipment as well as other resources like electricity, manpower, operation costs, etc. As such, at the end of it, all Parallel Testing is an expensive testing technique.
  • Double The Workload – the same amount of identical work has to be performed on two or more systems, this increases the workload. A dramatic increase in workload can lead to unexpected errors and oversight.

When Is Parallel Testing Most Useful?

Parallel Testing is most useful and productive when a new system is being introduced in place of an older one. In order for continuity to be maintained, both systems are tested in parallel, until the new system proves its mettle. Once Parallel Testing confirms the fortitude of the new software, it replaces the older one without breaking its continuity.


Parallel Testing is a constructive way of ensuring that there is no break in the flow while the earlier version of any software is being replaced. In the same manner, when testing functionalities in parallel it leads to tremendous time savings which can help meet deadlines without compromising on the quality. To conclude the benefits of Parallel Testing far outweigh its drawbacks. Therefore, there is no need to compromise on the quality of the final product by doing away with this testing technique.