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retesting and regression testing?

What is the difference between retesting and regression testing?

by smallnet

Software testing is one of the most critical stages of the software development life cycle, aimed at delivering a reliable and faultless final product. These terms may seem alike, but they play an important role in ensuring software quality. This article examines the distinction between retesting.


Retesting entails ensuring that a particular defect or problem detected in an earlier test period has been resolved. This includes re-running the same test case or a set of test cases that revealed the problem. The main purpose of retesting is to prove that the reported bug has been fixed and there are no new errors brought about by the fix.

Key Points About Retesting: 

  • Targeted Testing: The validation of a particular solution is the target of retesting; it is specific and targeted.
  • Narrow Scope: It is intended to address a particular defect or problem rather than the whole application.
  • Verification: This is intended to confirm that the problem is solved and there is no regression in place.

Regression Testing: 

In contrast, regression testing involves a broader testing approach that seeks to ensure that recent code changes and enhancements. Also, new features in the software have not caused unknown defects or any unintended side effects. Re-execution of a comprehensive suite of tests designed to cover all the functions of an application, including the areas where defects were found

Key Points About Regression Testing: 

  • Comprehensive Testing: The regression testing includes many test cases and different elements of the application.
  • Prevention: The main purpose of it is to avoid introducing new defects resulting from the code changes.
  • Continuous Process: Regression testing is an integral part of the development cycle that occurs throughout the entire development cycle.


  • Scope: Test scope is the most significant distinction. Retesting is geared towards specific defects, while regression trial covers the whole application, ensuring the integrity of the software.
  • Objective: Retesting verifies the fix of a known issue and confirms its resolution. On the other hand, regression testing targets finding new defects or unexpected effects originating from recent modifications of code.
  • Test Cases: Retesting employs a similar case to the one that unveiled the problem, whereas regression trial uses a comprehensive case that covers most of the functionalities.
  • Frequency: When a defect is discovered, it is retested as necessary; retesting is done continuously during development to catch any regression early.


Finally, both retesting and regression trial are vital aspects of the software trial process; they differ in their purposes, but they play equal roles. Retesting shows that some specific defects have been eliminated from the system, and regression trial ensures that there will not be any new bugs when you change the software. It is important to know how these two testing methodologies differ for one to keep the software quality high. This also aims at guaranteeing that the final product is capable of meeting reliability and functionality requirements. To make your software application robust and defect-free, integrate retesting and regression trial is a part of your trial strategy.

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