He might have done a quantitative study, but there's no indication that he did. If he'd shown his working and described his methodology then I'd believe him, bu

He might have done a quantitative study, but there's no indication that he did. If he'd shown his working and described his methodology then I'd believe him, but since he doesn't I estimate that he probably pulled that number ex anum. There aren't any useful metrics for coder productivity anyway. You can measure lines per day, but that's not telling you what you want to know. The best programmers aren't best because they do simple tasks twenty-five times faster than the average programmer, they're the best because they do really difficult tasks in ways that the average programmer would never, ever do.