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

Different types of design documents which can be used to write effective test cases(if FRS and SRS is not enough to write the test cases.)

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