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[[Glenford J. Myers]] initially introduced the separation of [[debugging]] from testing in 1979.<ref name="Myers 1979">{{Cite book |last=Myers |first=Glenford J. |url=https://archive.org/details/artofsoftwaretes00myer |title=The Art of Software Testing |publisher=John Wiley and Sons |year=1979 |isbn=978-0-471-04328-7 |author-link=Glenford Myers}}</ref> Although his attention was on breakage testing ("A successful test case is one that detects an as-yet undiscovered error."<ref name="Myers 1979" />{{rp|16}}), it illustrated the desire of the software engineering community to separate fundamental development activities, such as debugging, from that of verification.
Software testing typically includes handling software bugs {{endash}} a defect in the [[source code|code]] that causes an undesirable result.<ref name="IEEEglossary">{{Citation |date=1990 |publisher=IEEE |doi=10.1109/IEEESTD.1990.101064 |isbn=978-1-55937-067-7 |title=IEEE Standard Glossary of Software Engineering Terminology }}</ref>{{rp|31}} Bugs generally slow testing progress and involve [[programmer]] assistance to [[debug]] and fix.
Not all defects cause a failure. For example, a defect in [[dead code]] will not be considered a failure.
A defect that does not cause failure at one point in time may lead to failure later due to environmental changes. Examples of environment change include running on new [[computer hardware]], changes in [[source data|data]], and interacting with different software.<ref>{{Cite web |date=March 31, 2011 |title=Certified Tester Foundation Level Syllabus |url=https://www.istqb.org/downloads/send/2-foundation-level-documents/3-foundation-level-syllabus-2011.html |access-date=December 15, 2017 |publisher=[[International Software Testing Qualifications Board]] |at=Section 1.1.2 |format=pdf |archive-date=October 28, 2017 |archive-url=https://web.archive.org/web/20171028051659/http://www.istqb.org/downloads/send/2-foundation-level-documents/3-foundation-level-syllabus-2011.html |url-status=dead }}</ref>
== Goals ==
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