Answer / varshab

This Question has been asked several times in this
forum.Still I think there is confusion about the same.You
can refer ISTQB sylabi book as reference.

Error : Incorrect human action that can result in deviation
from expected result.

Bug/ Defect : Bug & defect is like two terms used for same
thing.Bug/ Defect is variation in component or system that
may cause component or system to fail to perform its
intened operation.

Error can lead to Bug/Defect then it can lead to failure of
system.

Answer / ravitheja.p

ERROR:error or mistake is a human action that produces
incorrect (or) wrong result

BUG:Bug is any expectation that hinders the entire software
or part of it.

DEFECT:A flaw in the system or product that causes the
component to fail

RISK:risk is a factor that results in negativity (or)cause
of loss (or) damage

failure:a variation from the actual and expected result

Answer / venkatesh

Error : Is an undesirable deviation from requirements

Bug : Is an error found BEFORE the application goes into
production

Defect :Is an error found AFTER the application goes into
production

Answer / swapna

Error/Mistake
A human action that produces an incorrect result.
E.g.:-Syntax error
Fault/Defect
A flaw in component or system that can cause the component
or system to fail to perform its required function.
E.g.:-An incorrect statement when u
divide number/zero we have an
execution time fault.
Failure/Bug
Deviation of the component or system from its expected
delivery, service or result.
E.g:-20/10=3 we should get 2 but it is
displaying output 3.

Answer / siva

Error: Error can be either syntax mismatch or runtime (ex:
even though code compiles correctly some times it won't run
correctly due dynamic linking of dlls) error or logical error
(ex: c = a + b, in C language that code works for 2 + 3 but
not for 35655 + 35655, which is a logical error)

Bug: When test engineer finds an issue first he confirms
whether this is issue or not by look at functional spec. If
he confirms its a bug, then it is called as bug.

Defect: When test engineer files/tracks that bug in a bug
tracking tool like Bugzilla or QC something like that there
after Bug becomes Defect.

But in general usage both bug & defect are same

Answer / sj16

Bug:: You know the issue but not the location is called Bug


Defect :: You know the location and issue is called Defect.


error :: mistakes by programmer ex syntax error etc....
is called error

Answer / vij

bug-Whne the functionality not affecting the appliation,bt
invalid data are printing

Error:When they do not meet the Customer requirement

Defect:Ecpected result not equal to actual result

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