Related:

• Undetectable errors are infinite in variety, in contrast to detectable errors, which by definition are limited.
  Laws of Computer Programming, IX...
• Gilb's Laws of Unreliability 1) Computers are unreliable, but humans are even more unreliable.
  Corollary: At the source of every error which is blamed on the computer you will find at least two human errors, including the error of blaming it on the computer....
• 1. Computers are unreliable, but humans are even more unreliable.
  2. The only difference between the fool, and the criminal who attacks a system is that the fool attacks unpredictably and on a broader front....
• At the source of every error which is blamed on the computer you will find at least two human errors, including the error of blaming it on the computer.