Many of you may be familiar with bus factor, lottery, truck factor, and/or bus/truck number. For those that aren't though, I wanted to take a small moment to explain it. The concept is quite simple. This "factor" is nothing more than a scary way of labelling the number of developers a project could stand to lose (get hit by a bus) before the project couldn't continue. People have various events in their lives that permit or prevent them from performing certain tasks. As with software development someone's ability to keep working on a project could be taken away by changing jobs, getting a promotion, winning the lottery and quitting, or the more tragic getting hit by a bus/truck.