In software development, a software project’s bus factor is an irreverent measurement of concentration of information in a single person, or very few people. The bus factor is the total number of key developers who would need to be incapacitated, (as by getting hit by a bus) to send the project into such disarray that it would not be able to proceed. Commentators have noted that the vanilla Linux kernel tree’s bus factor may be as low as one: the project’s founder and chief architect, Linus Torvalds.
The Daily Omnivore 
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