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During an interview with an major MNC , I was asked this curious question of " What is meant by pesticide paradox ? " I have been working as Test Engineer for almost 4 Years but I have never came across this terminology.

Can some one help me with a real time example ?

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I downvoted this because I do not believe the OP tried to figure it out for themselves. The top two or three results from a Google search for "pesticide paradox" should tell them what they need to know. –  user246 Jul 19 '13 at 13:08
First time I have heard the term as well and I've been doing it about 15 years now, if that's any consolation. Questions about something like this where it's not widely used/known seem kind of pointless for an interview. –  Sam Woods Jul 19 '13 at 16:10
Hi, karthik, there's plenty of information out there if you google "pesticide paradox" - perhaps you could update your question with more details of why that information isn't enough for you. –  Kate Paulk Jul 19 '13 at 18:24
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2 Answers

Pesticide Paradox

The phenomenon that the more you test software, the more immune it becomes to your tests - just as insects eventually build up resistance and the pesticide no longer works. [Beizer]

from: http://www.allthingsquality.com/p/testing-terms-glossary.html

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Boris Beizer wrote “Every method you use to prevent or find bugs leaves a residue of subtler bugs against which those methods are ineffectual.”

In the most simple terms not every method or technique will find or prevent all bugs, so we must use a variety of approaches, techniques, and methods in testing.

See this post for more info

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