Progress is possible only if we train ourselves to think about programs without thinking of them as pieces of executable code.
Edsger DijkstraRead
Program testing can be used to show the presence of bugs, but never to show their absence!
Interpretation
What this quote means
Testing can identify existing bugs in software, but it cannot guarantee that there are no bugs left.
In this quote, Edsger Dijkstra highlights a fundamental principle of software testing: while testing can demonstrate that bugs exist in a program, it cannot prove that a program is entirely free of defects. This reflects the inherent limitations of testing in the complex nature of software systems, where it is possible for undetected bugs to persist even after rigorous testing efforts.
Themes
TestingSoftwareBugsQualityProgramming
In practice
Example use cases
During a software development meeting to emphasize the importance of thorough testing to the team.
More from Edsger Dijkstra
All quotes βSimplicity is prerequisite for reliability.
Edsger DijkstraRead
The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
Edsger DijkstraRead
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 DijkstraRead
The tools we use have a profound and devious influence on our thinking habits, and therefore on our thinking abilities.
Edsger DijkstraRead
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 DijkstraRead
Similar quotes
I believe 3D is inevitable because it's about aligning our entertainment systems to our sensory system. We all have two eyes; we all see the world in 3D. And it's natural for us to want our entertainment in 3D as well. It's just getting the technology - it's really more the business model than the technology piece. We've solved the technology.
James CameronRead
We wanted flying cars, instead we got 140 characters.
Peter ThielRead
The factory of the future will have only two employees, a man and a dog. The man will be there to feed the dog. The dog will be there to keep the man from touching the equipment.
Warren G. BennisRead
The whole notion of passwords is based on an oxymoron. The idea is to have a random string that is easy to remember. Unfortunately, if it's easy to remember, it's something nonrandom like 'Susan.' And if it's random, like 'r7U2*Qnp,' then it's not easy to remember.
Bruce SchneierRead
I see the player piano as the grandfather of the computer, the ancestor of the entire nightmare we live in, the birth of the binary world where there is no option other than yes or no and where there is no refuge.
William GaddisRead
Most of the good programmers do programming not because they expect to get paid or get adulation by the public, but because it is fun to program.
Linus TorvaldsRead