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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
Bugs
Testing
Programming
Absence
Presence
Shows

More quotes by 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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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 problems of the real world are primarily those you are left with when you refuse to apply their effective solutions.
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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In their capacity as a tool, computers will be but a ripple on the surface of our culture. In their capacity as intellectual challenge, they are without precedent in the cultural history of mankind.
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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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 computing scientist's main challenge is not to get confused by the complexities of his own making.
Edsger Dijkstra
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The use of COBOL cripples the mind its teaching should, therefore, be regarded as a criminal offense.
Edsger Dijkstra
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It is practically impossible to teach good programming to students that have had a prior exposure to BASIC: as potential programmers they are mentally mutilated beyond hope of regeneration.
Edsger Dijkstra
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If debugging is the process of removing software bugs, then programming must be the process of putting them in.
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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There is very little point in trying to urge the world to mend its ways as long as that world is still convinced that its ways are perfectly adequate.
Edsger Dijkstra
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Industry suffers from the managerial dogma that for the sake of stability and continuity, the company should be independent of the competence of individual employees.
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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John von Neumann draws attention to what seemed to him a contrast. He remarked that for simple mechanisms, it is often easier to describe how they work than what they do, while for more complicated mechanisms, it is usually the other way around.
Edsger Dijkstra
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Computer science is no more about computers than astronomy is about telescopes.
Edsger Dijkstra
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I mentioned the non-competitive spirit explicitly, because these days, excellence is a fashionable concept. But excellence is a competitive notion, and that is not what we are heading for: we are heading for perfection.
Edsger Dijkstra
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Beauty is our business.
Edsger Dijkstra