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hii....

       please explain with examples....

 

 

nidhi

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Defect : Deviation from the expected results.
Bug : Cause of the Defect.

Note:
Bug is not an IEEE standard terminology for testing. (correct me if i am wrong)
then what is Error ?..
Error:- Its an human action that produces an incorrect result.
then what is Error ?.
bug is one which we find before the project goes into live.
defect when a fault found in production
defect: A flaw in a component or system that can cause the component or system to fail to perform its required function, e.g. an incorrect statement or data definition. A defect, if

encountered during execution, may cause a failure of the component or system. (bug, fault)



fail: A test is deemed to fail if its actual result does not match its expected result.



failure: Deviation of the component or system from its expected delivery, service or result.[After Fenton]



fault: A manifestation of an error in software. A fault, if encountered may cause a failure. [do178b]



incident: Any event occurring that requires investigation.
As per my information Defect and Bug are the same .
I have read some of the article of eminent personalities like James Bach,Cem Kaner,Rex BLack etc and they have used those term one instead another.I think if it has been asked in any interview then it is just to see how you react if different words of same meaning is thrown to you.

Similar example of like this in real world scenario
1. Electricity and Power
2. Mobile and Cell

Defect and Bug are same meaning words adopted by different organization.
Well, There are many definitions but it is matter of perspective

Defect is something that is perceived by end user as 'not working' or 'not useful' pr 'not upto his expectations'. He may say it is a defect. When this defect goes to developer, then he may classify it as a Bug or a feature or a 'not requested' feature or problem with user usage.

Eg. Some mail clients automatically add the mail sender to user's contact list. User can say it is a defect as he has not added it but the mail client developer can say it is not a bug but a feature

May be you can check
http://joshualedwell.typepad.com/usability_blog/2010/03/its-a-defec...
Defect:- A flaw in component or system that can cause the computer or system to fail to perform its required function.

Error:- Its an human action that produces an incorrect result..

Thanks,
Veer Ahir KK
Error: Any deviation from actual and expected result

It causes due to human mistake.

Eg: While reviving an requirement document or can say any other project related document if we find any mistake then it is Error.

Bug:It is found in development environment before the product is skipped to the customer.

Eg:When the product is released to testing department and if any deviation is found w.r.t requirement by tester then it is called as Bug.

Defect:It is found in product itself when the product is skipped to customer.

Eg: when the product is skipped to customer while using the product if customer find any deviation then it is called as Defect

Thanks and Regards
Ajay Pardhi
venu and pawan kumar have given correct answer. When you purchase a product from a shop, if you find any deviation you call it has defect not bug.
actually we have many terms that leads to software failure:
1- A Human can make an Error (aka a Mistake)
- An Error is ‘A Human Action that produces an Incorrect Result’
2- The Error can cause a Defect (aka a Fault or Bug)
- A Defect is ‘A flaw in a component or system that can cause the component or system to fail to perform its required function’
- A Defect can be in the Software, System or in a Document


# failure: ‘Deviation of the component or system from its expected delivery, service or result’

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