Edsger W Dijkstra Quotes

Program testing can be used to show the presence of bugs, but never to show their absence! ~ Edsger W. Dijkstra

Your obligation is that of active participation. You should not act as knowledge-absorbing sponges, but as whetstones on which we can all sharpen our wits ~ Edsger W. Dijkstra

I mean, if 10 years from now, when you are doing something quick and dirty, you suddenly visualize that I am looking over your shoulders and say to yourself "Dijkstra would not have liked this", well, that would be enough immortality for me. ~ Edsger W. Dijkstra

The question of whether a computer can think is no more interesting than the question of whether a submarine can swim. ~ Edsger W. Dijkstra

It is not only the violin that shapes the violinist, we are all shaped by the tools we train ourselves to use, and in this respect programming languages have a devious influence: they shape our thinking habits. ~ Edsger W. Dijkstra

Let me try to explain to you, what to my taste is characteristic for all intelligent thinking. It is, that one is willing to study in depth an aspect of one's subject matter in isolation for the sake of its own consistency, all the time knowing that one is occupying oneself only with one of the aspects. We know that a program must be correct and we can study it from that viewpoint only; we also know that it should be efficient and we can study its efficiency on another day, so to speak. In another mood we may ask ourselves whether, and if so: why, the program is desirable. But nothing is gained - on the contrary! - by tackling these various aspects simultaneously. It is what I sometimes have called "the separation of concerns", which, even if not perfectly possible, is yet the only available technique for effective ordering of one's thoughts, that I know of. This is what I mean by "focusing one's attention upon some aspect": it does not mean ignoring the other aspects, it is just doing justice to the fact that from this aspect's point of view, the other is irrelevant. It is being one- and multiple-track minded simultaneously. ~ Edsger W. Dijkstra

I don't know how many of you have ever met Dijkstra, but you probably know that arrogance in computer science is measured in nano-Dijkstras. ~ Alan Kay

Simplicity is prerequisite for reliability. ~ Edsger W. Dijkstra

Besides a mathematical inclination, an exceptionally good mastery of one's native tongue is the most vital asset of a competent programmer. ~ Edsger W. Dijkstra

Computer Science is no more about computers than astronomy is about telescopes ~ Edsger W. Dijkstra

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 W. Dijkstra

For me, the importance of photography is that you can point to something, that you can let other people see things. Ultimately, it is a matter of the specialness of the ordinary. ~ Rineke Dijkstra

My point today is that, if we wish to count lines of code, we should not regard them as "lines produced" but as "lines spent": the current conventional wisdom is so foolish as to book that count on the wrong side of the ledger. ~ Gotze Dijkstra

As a photographer you enlarge or emphasize a certain moment, making it another reality. ~ Rineke Dijkstra

I am interested in the paradox between identity and uniformity, in the power and vulnerability of each individual and each group. It is in this paradox that I try to visualize by concentrating on poses, attitudes, gestures, and gazes. ~ Rineke Dijkstra

For me it is essential to understand that everyone is alone. Not in the sense of loneliness, but rather in the sense that no one can completely understand someone else. I know very well what Diane Arbus means when she says that one cannot crawl into someone else's skin, but there is always an urge to do so anyway. I want to awaken definite sympathies for the person I have photographed. ~ Rineke Dijkstra

I felt that the beach portraits were all self-portraits. That moment of unease, that attempt to find a pose, it was all about me. ~ Rineke Dijkstra