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what is defect clustering and pesticide paradox?
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Answer Posted / anonyme
pesticide paradox:
Pesticide paradox describes a common problem in
exterminating bugs -- both the 6-legged and software
varieties.
Insects that survive the use of pesticide are those that
are more immune to the poison than others. These bugs'
offspring are then also likely to be immune to the
pesticide. This requires that pesticide companies
continually work at developing new poisons that will kill
whatever survived their previous products.
The same occurs in software. If we create bug prevention or
testing processes that tend to prevent and find particular
types of bugs, other types of bugs will thrive because our
attention is focused elsewhere. Also, designers,
developers , and testers are likely to learn from their
mistakes and not make the same mistakes again -- they will
make new ones. This causes scripted testing -- whether
manual or automated -- to become less effective over time.
Good testing requires continual development of new testing
ideas. Old regression scripts can be useful but testing
should not stop there. Regression tests will not find the
bugs that are lurking off the beaten path.
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