An interactive debugger is an outstanding example of what is not needed - it encourages trial-and-error hacking rather than systematic design, and also hides marginal people barely qualified for precision programming. Harlan Mills More Quotes by Harlan Mills More Quotes From Harlan Mills The only way for errors to occur in a program is by being put there by the author. No other mechanisms are known. Programs can't acquire bugs by sitting around with other buggy programs. Harlan Mills errors sitting way