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  • A failure is an external, incorrect behaviour with respect to the requirements or other description of the expected behaviour. <bib>ammann-offutt:2008</bib>, <bib>delamaro:slides:2009</bib>


  • A failure is the consequence of the propagation of an error. <bib>vicenzi-etal:slides:2007</bib>
  • A failure occurs when a faulty piece of code is executed leading to an incorrect state that propagates to the program's output. <bib>mathur:2008</bib>
  • It is often very difficult to relate a failure to the associated fault. <bib>ammann-offutt:2008</bib>