Difference Between Regression Testing & Retesting

Many testing aspirants have difficulty in understanding the difference between what regression testing and retesting.

In this blog, we are going to look into the key difference between these two types of testing. Also, we are going to learn more about the relationship between regression testing and retesting.

So, let’s try to answer the question

What is the difference between Regression Testing and Retesting?

Regression Testing is a category of Software Testing Services performed to make sure the change in the code has not disturbed the current features & functions of the tested application.


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Re-testing is performed to ensure that the test cases that failed the final execution are successfully passed and those failures are fixed.

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Regression Testing Services

In the Regression Testing, the test cases are extracted from functional testing to ensure that no new defects are included due to the software update/change & to check whether original features and functionality are working as expected.

Regression testing also ensures that no new defect is introduced to the system. Once the regression test suite is created, the test cases can be automated using automation tool but the same is not applicable for Re-testing.

Jumping into the detailed comparison

Regression TestingRe-Testing
Regression testing is to make sure that changes have not affected unaffected part.Re-testing is performed to ensure that the test cases that failed the final execution are successfully passed and those failures are fixed.
The role of Regression testing is to makes sure there is no side effects to existing functionalities after the new code changes.Re-testing is performed on the basis of the Defect fixes.
Test cases that passed previously can be included in regression testing to make sure the earlier functionality is working fine.In Retesting, the cases which are failed earlier can be included to check if the functionality failure in an previous build.
In Regression, the test cases are usually derived from functional specifications, user manuals, tutorials and deficiency reports.Test cases in Retesting can’t be set up before begin testing. Here, the failed test cases of previous execution are just re-executed.
Automation is critical when it comes to regression testing. Performing regression testing manually will become more expensive. Automation always complements the regression test process.Test cases intended for re-testing cannot be automated due to uncertainty
Defect verification doesn’t fall underneath Regression testing.Defect verification falls within Retesting.
Depending upon the availability of the resources, regression testing and retesting can be done simultaneously.Retesting is given priority over Regression testing, as a result retesting is performed before regression.

In regression testing services, the developer fixes the defect registered by a tester during testing the software application. While in Retesting the same defect is checked to make sure whether the defect is fixed or not. For this they use the stages to reproduce stated in the defect.

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