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  1. #1
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    why system testing is conducted by testing team

    Hi all,

    I have a basic question regading testing team.

    Why system testing is done by testing team?

    Thanking you,

    cheers
    Jai

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    Re: why system testing is conducted by testing team

    Because System Testing has that magic word Testing in it??? Only professional testers truly know how to test, or at least should know.
    Personal Comment

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    Re: why system testing is conducted by testing team

    Hi rich,

    Thanks for the quick reply.

    if the development team in the orgnization is going with test driven approch then most of the developers knows what is testing and how to test.As this Application is made by them it self So i think testing(system test) can also performed by development team.

    What do you say?

    cheers
    jai

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    Re: why system testing is conducted by testing team

    That is the single biggest misconception in the IT industry today.

    I take it you are a developer?

  5. #5
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    Re: why system testing is conducted by testing team

    At least two reasons: 1) developer hate to test 2) If tests are not 100% scripted (documented each mouse click and exact values to verify) developers could be 'blind' regarding many defects that don't have such an obvious consequences as General Protection Fault.
    Still I know companies that have developers to do system tests and quite successful. And there are also companies where developers are doing technical writer job…
    ?:the art of a constructive conflict perceived as a destructive diagnose.
    Ainars

  6. #6
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    Re: why system testing is conducted by testing team

    Nope, there's a hole in your logic and a bad assumption there Jai!

    Just because the Developers can test their units and modules, does not mean they are familiar with how the overall system works. Plus it is their units and modules they are testing, which tends to be a bit incestuous in that they wrote them and tested them by their own interpretation of the requirements, or engineering plans.

    Secondly, development testing is a reverse in the SDLC evolution plan.

    The stages a software company goes through as they evolve are:

    1. Developers write and test.
    2. Testing is performed by in-house people with scripts in front of them, people like secretaries, accountants, etc.
    3. Testing is done by a group of Beta outside testers, paid or volunteer.
    4. Testing is done by a select group of testers who are trained in the methodology of testing.

    Not that all of this is true for every company, but it is a sort of evolution. To have the Developers test their own products puts you back to the first epoch of evolution, and can't be a good thing. Test driven development is a good thing, but the tests need to be developed by trained, skilled testers and run by them also if for nothing more than objectivity. This give a 3rd party atmosphere and makes the customer more at ease with the product. Developers just are not trained to test, nor should they be.

    Try reading this first: "Testers and Developers Think Differently." by Bret Pettichord. http://www.pettichord.com/
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    Success is the ability to go from one failure to another with no loss of enthusiasm.
    ~ Winston Churchill ~


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  7. #7
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    Re: why system testing is conducted by testing team

    Hi All,

    I have just joined this group and would like to post a reply here.

    System Testing is usally done after Component Integration testing is completed which is done by the developers. The purpose of System testing differs from componenet testing and componenet integration testing.

    At system level the testing is of the total system including functionality, quality attributes, and wider issues such as system objectives. The system is tested as a whole in a configuration/enviornment.

    Since system testingis still testing by the software development organisation, the purpose of the testing is still to find errors. The errors to be found at this level can occur in a number of different areas and often cannot be found before testing is performed at this level.

    The development team cannot keep doing this and have to concentrate on their prime area which is coding and not testing.

    For this reason, according to me system testing is done by the testing team.

    Romil

  8. #8
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    Re: why system testing is conducted by testing team

    i agree with jhol,
    System testing is actually a series of different tests whose primary purpose is to fully exercise the computer-based system. Although each test has a different purpose, all Work to verify that all system elements have been properly integrated and perform allocated functions.
    System testing is black box testing, performed by the Test Team, and at the start of the system testing the complete system is configured in a controlled environment. The purpose of system testing is to validate an application's accuracy and completeness in performing the functions as designed.
    For this reason, according to me system testing is done by the testing team.
    i hope you got the answer.

    [ 10-20-2005, 01:53 AM: Message edited by: GNagaraju ]
    Raju

  9. #9
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    Re: why system testing is conducted by testing team

    May I remind you Newbies to read the question! Then read the answers! Then if you can add some more which will, in your minds, help to clarify the answer, go for it. If some one else has already, adequately answered the question, then please don't answer it again. But RTFQ! Jai did not ask what System Testing is, so don't pretend that you know by posting a non-accredited definition. If you copy the data from a web page or paper, please make it a quote and give credit to the originator.

    Better yet, read our FAQ first!

    Thank you and happy postings. [img]images/icons/smile.gif[/img] [img]images/icons/smile.gif[/img] [img]images/icons/smile.gif[/img]
    Personal Comment

    Success is the ability to go from one failure to another with no loss of enthusiasm.
    ~ Winston Churchill ~


    ...Rich Wagner

  10. #10
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    Re: why system testing is conducted by testing team

    Rich,

    Rich, you said that developers are not trained to test, nor should they be. I disagree with you on that one....

    Jai, besides the reasons already posted here, part of the reason for professional testing is to provide reusable, auditable test assets, which involves more than (for example) imbedded junit scripts. There is also regression testing to consider; although test-driven development can cover new/changed features on a modular basis, they rarely include retesting existing features to ensure nothing else was impacted. They also rarely address business flow. In other words, the tests might be run, but not in the logical order or in the same way as the system will actually be used. Test data and files are often stubbed during early test phases; use of more realistic data during system testing can also drive out error.

    - Linda

 

 
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