'What do you mean we need to be a software company?' asked Lukas Braunschweiler, CEO of Sonova, one of the world's leading manufacturers of high-tech hearing devices. I had just finished giving a talk to their senior leadership team at the gorgeous lakeside town of Stäfa, near Zurich. 'We already have lots of software engineers. Are you saying that we need more?' It was a fair question, and one I had spent much of the prior week thinking about, in a few unusual places. How many software engineers do you need to transform a company?