“The real value of tests is not that they detect bugs in the code, but that they detect inadequacies in the methods, concentration, and skills of those who design and produce the code.”
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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C. A. R. Hoare 16
British computer scientist 1934Related quotes

Source: A spiral model of software development and enhancement. (1988), p. 61-62

“Beware of bugs in the above code; I have only proved it correct, not tried it.”
Donald Knuth's webpage http://www-cs-faculty.stanford.edu/~knuth/faq.html states the line was used to end a memo entitled Notes on the van Emde Boas construction of priority deques: An instructive use of recursion (1977)

Source: Are you being brainwashed?: Propaganda in science textbooks (2007), p. 24
Source: Object-oriented design: a responsibility-driven approach (1989), p. 13
Zachman cited in: Carol O'Rourke, Neal Fishman, Warren Selkow (2003) Enterprise architecture using the Zachman Framework. p. 538

letter, 19 April 1951, published in Raymond Chandler Speaking (1962)