One of the interesting things about the Linux kernel is that the vast majority of people who contribute to it are employed by companies to do this work; however, most of the academic research on open source software assumes that participants are volunteers, contributing because of some personal need or altruistic motivation. Although this is true for some projects, this assumption just isn’t valid for projects like the Linux kernel. To learn more, I interviewed 16 kernel developers to talk about how people work together in the kernel.