Absence Quote by Edsger Dijkstra
“Testing shows the presence, not the absence of bugs.”
About This Quote
Source Book: "The Humble Programmer", 1972, Computer Science
Testing reveals existing bugs but cannot prove they are absent, highlighting testing’s inherent limits.
In simple terms: Testing finds bugs, not guarantees none.
Key Takeaway
Combine testing with formal verification for reliability.
Themes
software
testing
quality
limitations
Mood
analytical
cautious
Type
technical
educational
When to use this quote
- software development
- critical systems
- quality assurance
Key Concepts
bug detection
verification methods
Questions to Reflect On
- What complementary methods can ensure software correctness?
- How do we balance testing depth with resource constraints?
A Different Perspective
Relying solely on testing can miss hidden defects.
![“What [my patients] care about is my presence or absence as a human being. They gauge with unerring eye whether I am grounded enough on any given day to co-exist with them, to listen to them as persons with feelings, hopes and aspirations as valid as mine. They can tell instantly whether I’m…” quote by Gabor Maté](https://sms4smile.com/quotes/img-quotes/d98/gabor-mat-1410_addiction-and-recove_what-my-patients-care-about-is-my-presen_644472.jpg)
![“Please don't fall into the trap of believing that I am terribly dogmatical about [the goto statement]. I have the uncomfortable feeling that others are making a religion out of it, as if the conceptual problems of programming could be solved by a single trick, by a simple form of coding discipline!” quote by Edsger Dijkstra](https://sms4smile.com/quotes/img-quotes/6ad/edsger-dijkstra-5102_believe_please-don-t-fall-into-the-trap-of-belie_167695.jpg)
