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Testing shows the presence, not the absence of bugs.

Edsger Dijkstra

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Edsger Dijkstra
Age: 72 †
Born: 1930
Born: May 11
Died: 2002
Died: August 5
Computer Scientist
Engineer
Mathematician
Physicist
Scientist
University Teacher
R'dam
Edsger Dijkstra
Edsger Wybe Dijkstra
Dijkstra
EWD
E.W. Dijkstra
Testing
Programming
Absence
Presence
Shows
Bugs

More quotes by Edsger Dijkstra

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When we had no computers, we had no programming problem either. When we had a few computers, we had a mild programming problem. Confronted with machines a million times as powerful, we are faced with a gigantic programming problem.
Edsger Dijkstra
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The art of programming is the art of organizing complexity.
Edsger Dijkstra
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We shall do a much better programming job, provided that we approach the task with a full appreciation of its tremendous difficulty, provided that we stick to modest and elegant programming languages, provided that we respect the intrinsic limitations of the human mind and approach the task as Very Humble Programmers.
Edsger Dijkstra
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The effective exploitation of his powers of abstraction must be regarded as one of the most vital activities of a competent programmer.
Edsger Dijkstra
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Simplicity is a great virtue but it requires hard work to achieve it and education to appreciate it. And to make matters worse: complexity sells better.
Edsger Dijkstra
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Simplicity is prerequisite for reliability.
Edsger Dijkstra
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Too few people recognize that the high technology so celebrated today is essentially a mathematical technology.
Edsger Dijkstra
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... as a slow-witted human being I have a very small head and I had better learn to live with it and to respect my limitations and give them full credit, rather than to try to ignore them, for the latter vain effort will be punished by failure.
Edsger Dijkstra
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Teaching to unsuspecting youngsters the effective use of formal methods is one of the joys of life because it is so extremely rewarding.
Edsger Dijkstra
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LISP has jokingly been described as the most intelligent way to misuse a computer. I think that description is a great compliment because it transmits the full flavour of liberation: it has assisted a number of our most gifted fellow humans in thinking previously impossible thoughts.
Edsger Dijkstra
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If in physics there's something you don't understand, you can always hide behind the uncharted depths of nature. You can always blame God. You didn't make it so complex yourself. But if your program doesn't work, there is no one to hide behind. You cannot hide behind an obstinate nature. If it doesn't work, you've messed up.
Edsger Dijkstra
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If there is one 'scientific' discovery I am proud of, it is the discovery of the habit of writing without publication in mind.
Edsger Dijkstra
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Programming is one of the most difficult branches of applied mathematics the poorer mathematicians had better remain pure mathematicians.
Edsger Dijkstra
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PL/1, the fatal disease, belongs more to the problem set than to the solution set.
Edsger Dijkstra
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The use of anthropomorphic terminology forces you linguistically to adopt an operational view. And it makes it practically impossible to argue about programs independently of their being executed.
Edsger Dijkstra
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Besides a mathematical inclination, an exceptionally good mastery of one's native tongue is the most vital asset of a competent programmer.
Edsger Dijkstra
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The prisoner falls in love with his chains.
Edsger Dijkstra
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Computer science is no more about computers than astronomy is about telescopes.
Edsger Dijkstra
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Beauty is our business.
Edsger Dijkstra
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Aim for brevity while avoiding jargon.
Edsger Dijkstra