„Testing shows the presence, not the absence of bugs“

Dijkstra (1969) J.N. Buxton and B. Randell, eds, Software Engineering Techniques, April 1970, p. 16. Report on a conference sponsored by the NATO Science Committee, Rome, Italy, 27–31 October 1969. http://homepages.cs.ncl.ac.uk/brian.randell/NATO/nato1969.PDF Possibly the earliest documented use of the famous quote.
1960s

Última atualização 22 de Maio de 2020. História
Edsger Dijkstra photo
Edsger Dijkstra3
1930 - 2002

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„Program testing can be used to show the presence of bugs, but never to show their absence!“

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Dijkstra (1970) " Notes On Structured Programming http://www.cs.utexas.edu/users/EWD/ewd02xx/EWD249.PDF" (EWD249), Section 3 ("On The Reliability of Mechanisms"), corollary at the end.
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Variante: Program testing can be a very effective way to show the presence of bugs, but it is hopelessly inadequate for showing their absence.

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Contexto: Being is both presence and absence. God had to conceal His presence in order to bring the world into being. He had to make His absence possible in order to make room for the world's presence. Coming into being brought along denial and defiance, absence, oblivion and resistance.

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—  C. A. R. Hoare British computer scientist 1934

How Did Software Get So Reliable Without Proof? Lecture Notes in Computer Science vol 1051 1996 pp. 1-17 : FME '96: Industrial Benefit and Advances in Formal Methods, Third International Symposium of Formal Methods Europe, Co-Sponsored by IFIP WG 14.3, Oxford, UK, March 18-22, 1996, Proceedings.

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„Women tend to love men in their presence, while men tend to love women in their absence.“

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