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

—  Edsger W. Dijkstra

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

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Edsger W. Dijkstra photo
Edsger W. Dijkstra 68
Dutch computer scientist 1930–2002

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