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Edsger W. Dijkstra

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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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Edsger W. Dijkstra

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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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In nature, it is divinity, rather than history, which Thomas responds to most. ... Thomas finds the God of nature elusive, but when He reveals Himself, he does so through the natural world. Godís reflection, His shadow, and His echo exist in the Welsh hills. His influence there is both a presence and an absence (and, at times, an absence that is like a presence).

 
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FORTRAN, 'the infantile disorder', by now nearly 20 years old, is hopelessly inadequate for whatever computer application you have in mind today: it is now too clumsy, too risky, and too expensive to use.

 
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There are no significant bugs in our released software that any significant number of users want fixed. Ö I'm saying we don't do a new version to fix bugs. We don't. Not enough people would buy it. You can take a hundred people using Microsoft Word. Call them up and say "Would you buy a new version because of bugs?" You won't get a single person to say they'd buy a new version because of bugs. We'd never be able to sell a release on that basis.

 
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