Dave Parnas

“Whenever anyone says, 'theoretically,' they really mean, 'not really.'”

“As a rule, software systems do not work well until they have been used, and have failed repeatedly, in real applications.”

“My judgment is that research in 'Star Wars' is going to fail, and I believe this so strongly that I'm willing to stake my professional reputation on this. I don't believe anybody is going to build this thing.”

“There are no standards for computer programmers and no group to certify them.”

“When someone builds a bridge, he uses engineers who have been certified as knowing what they are doing. Yet when someone builds you a software program, he has no similar certification, even though your safety may be just as dependent upon that software working as it is upon the bridge supporting your weight.”