Theory: A defect can only be discovered in an environment that contains the defect.
This seems very obvious! So why even bother to mention it, let alone post a blog entry about it? The motivation for this entry comes from a familiar situation that i am sure most testers would have encountered.
Software testers devise extensive sets of tests and execute them prior to a product’s release. These tests are usually executed on setups that testers have prepared in their lab environment. Many organizations may have invested significant sums of money to have the lab infrastructure in place. However, what generally tends to happen is that when this product is released, the customer reports issues pretty quickly. So, what happened? What happened to all the man-hours spent on testing and the investment on expensive lab equipment? Why did our in-house testing efforts not show up these defects that a customer seemed to find “easily”? What are we doing wrong?
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