Monday, August 20, 2007

Difference between defect,error,bug,failure and fault

Error : A discrepancy between a computed, observed, or measured value or condition and the true, specified, or theoretically correct value or condition. See: anomaly, bug, defect, exception, and fault

Failure: The inability of a system or component to perform its required functions within specified performance requirements. See: bug, crash, exception, fault.

Bug: A fault in a program which causes the program to perform in an unintended or unanticipated manner. See: anomaly, defect, error, exception, fault.

Fault: An incorrect step, process, or data definition in a computer program which causes the program to perform in an unintended or unanticipated manner. See: bug, defect, error, exception.

Defect: Mismatch between the requirements.
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39 comments:

  1. UnknownJuly 21, 2008 at 5:28 AM

    Good Answar,
    Thank you.

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  2. AnonymousOctober 14, 2010 at 6:01 AM

    thanks for ur valid info

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  3. Ashwinikumar J.December 18, 2010 at 9:46 PM

    Thanks. Satisfactory answer.

    ReplyDelete
  4. LiaDecember 26, 2010 at 1:45 AM

    This question do confuses a lot. There is a slight difference between these terms but most of the people think that they are same. But you have made it clear that they are different.
    Software testing videos  

    ReplyDelete
  5. vipinJanuary 24, 2011 at 2:43 AM

    good answer,
    explain with proper example.

    http://soft-engineering.blogspot.com

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  6. Rob 朗武February 1, 2011 at 11:27 PM

    So... if there is a fault in the system code but the user never perceives it, is it really a bug?


    Mmm, programming Zen...

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  7. UnknownMarch 1, 2011 at 2:49 AM

    This comment has been removed by the author.

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  8. UnknownMarch 1, 2011 at 2:50 AM

    Thank you. Excellent Post.

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  9. UnknownApril 21, 2011 at 12:56 PM

    best ans.

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  10. PraveenMay 4, 2011 at 5:21 AM

    thank you very much

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  11. UnknownMay 5, 2011 at 10:21 PM

    actually error is caused by human mistakes

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  12. SHIVESH SINGHMay 11, 2011 at 9:46 PM

    V good information

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  13. ramMay 21, 2011 at 6:40 PM

    very good & clear answer.
    thanks

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  14. kalaivaniJuly 5, 2011 at 2:31 AM

    thanks for ur clear definition.

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  15. sobhaJuly 21, 2011 at 3:53 AM

    I Got very good answer

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  16. AnonymousAugust 8, 2011 at 10:28 AM

    very useful ya

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  17. UnknownAugust 11, 2011 at 1:19 AM

    thanks! informative !

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  18. AnonymousSeptember 21, 2011 at 9:32 AM

    Bug example:
    1. crash while click on any button.
    2. Deadlock, unable to move on next page.

    Defects:
    1. Wrong calculations.
    2. Unexpected result.
    3. Result not as per the requirement.etc

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  19. SanjayOctober 17, 2011 at 1:10 AM

    error is caused by human mistakes.
    Bug is variance between actual n expected result.

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  20. SHAILESH SAXENA, Java DeveloperNovember 26, 2011 at 9:52 AM

    really goooood work..thanx a lot...
    I think its the best answer as I have searched many sites for it.....thanx again...

    ReplyDelete
  21. ishaDecember 27, 2011 at 3:09 AM

    for this answer please visit once at www.testingdream.com
    it will help you...

    ReplyDelete
  22. nazeerJanuary 16, 2012 at 9:56 AM

    thanks for letting me know some of the basic terminologies relate to computer

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  23. PREMJanuary 22, 2012 at 12:03 AM

    Thanks for valid information.......If there is no error in program than no bug,no failure will become..

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  24. suhasini konduruFebruary 29, 2012 at 10:05 PM

    Good explanation.
    Thanks.

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  25. VishwanathMarch 7, 2012 at 12:21 AM

    Error:Progamatically mistake leads to error.
    Bug:Deviation from the expected result.
    Defect:Problem in algorithm lead to failure
    Failure:When everything is correct but we are not able to get a result

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  26. suresh kannanMay 10, 2012 at 7:10 AM

    Ya Realy its helpful for us who are preparing for the interview and to learn things...Thanks

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  27. aviMay 21, 2012 at 7:40 PM

    This comment has been removed by the author.

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  28. aviMay 21, 2012 at 7:40 PM

    Good 1 :D

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  29. Penna SparrowJuly 1, 2012 at 7:29 AM

    Nice Answer

    Difference between Testing and Debugging

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  30. Yugandhar SharmaAugust 14, 2012 at 12:03 AM

    Error: An Human actions produce some incorrect results that is called error.

    Bug:During the execution of program founding some error.

    Defect:- What we supposed to do and does not work as what we excepted in the behavior of application.

    Failure:When software is relesed, the customers found some defects or application may be crash by using any wrong functionality that is called software Failure.

    I hope you all like this answer.

    Regards:- http://y-seotechniques.blogspot.com/

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  31. ydsinghAugust 15, 2012 at 7:47 PM

    Have gone through multiple websites before stumbling upon this one.. perfect answer! kudos!

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  32. UnknownAugust 20, 2012 at 9:37 PM

    Thnx alot for the clear definition..it help me alot to understand the basic differences betwen these terms..

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  33. JVAugust 28, 2012 at 12:35 AM

    Thanks

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  34. UnknownSeptember 9, 2012 at 9:31 AM

    fault : problem that can be rewinded to overcome the loss


    failure :problem that results in certain assets loss..

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  35. @viSeptember 20, 2012 at 2:12 AM

    Welcome...

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  36. UnknownNovember 7, 2012 at 9:41 PM

    Defects: The concrete manifestations of errors within the software. One error may cause several defects and various errors may cause identical defects

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  37. muraliMarch 1, 2013 at 3:42 AM

    This comment has been removed by the author.

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  38. muraliMarch 1, 2013 at 3:43 AM

    Error: Finding defects without executing of any code through verification of document.

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  39. muraliMarch 1, 2013 at 3:46 AM

    Error: Finding defects without executing of any code through verification of document.

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