Nine Illuminating Quotes on Debugging Here we present you a list of quotes about debugging programs by renowned developers and programmers from around the world. Quote #1 Of all my programming bugs, 80% are syntax errors. Of the remaining 20%, 80% are trivial logical errors. Of the remaining 4%, 80% are pointer errors. And the remaining 0.4% are hard. – Marc Donner, IBM Watson Research Center Quote #2 It takes three times the effort to find and fix bugs in system test than when done by the developer.