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Answer Posted / parul
Testing is potentially endless. We can not test till all
the defects are unearthed and removed -- it is simply
impossible. At some point, we have to stop testing and ship
the software. The question is when.
Realistically, testing is a trade-off between budget, time
and quality. It is driven by profit models. The
pessimistic, and unfortunately most often used approach is
to stop testing whenever some, or any of the allocated
resources -- time, budget, or test cases -- are exhausted.
The optimistic stopping rule is to stop testing when either
reliability meets the requirement, or the benefit from
continuing testing cannot justify the testing cost.
[Yang95] This will usually require the use of reliability
models to evaluate and predict reliability of the software
under test. Each evaluation requires repeated running of
the following cycle: failure data gathering -- modeling --
prediction. This method does not fit well for ultra-
dependable systems, however, because the real field failure
data will take too long to accumulate.
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