Software regression

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A software regression is a software bug that makes a feature stop functioning as intended after a certain event (for example, a system upgrade, system patching or a change to daylight saving time).[1] A software performance regression is a situation where the software still functions correctly, but performs more slowly or uses more memory or resources than before.[2]

Regressions are often caused by encompassed bug fixes included in software patches. One approach to avoiding this kind of problem is regression testing. A properly designed test plan aims at preventing this possibility before releasing any software.[3] Automated testing and well-written test cases can reduce the likelihood of a regression.

A software regression can be of one of three types:

  • Local – a change introduces a new bug in the changed module or component.
  • Remote – a change in one part of the software breaks functionality in another module or component.
  • Unmasked – a change unmasks an already existing bug that had no effect before the change.

See also[edit]


  1. ^ Yehudai, Amiram; Tyszberowicz, Shmuel; Nir, Dor (2007). Locating Regression Bugs. Haifa Verification Conference. Retrieved 10 March 2018.
  2. ^ Shang, Weiyi; Hassan, Ahmed E.; Nasser, Mohamed; Flora, Parminder (11 December 2014). "Automated Detection of Performance Regressions Using Regression Models on Clustered Performance Counters" (PDF). Cite journal requires |journal= (help)
  3. ^ Richardson, Jared; Gwaltney, William Jr (2006). Ship It! A Practical Guide to Successful Software Projects. Raleigh, NC: The Pragmatic Bookshelf. pp. 32, 193. ISBN 978-0-9745140-4-8.