Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In software development, Bus Number is the number of developers on a project who could be removed (i.e. hit by a bus) before understanding of a particular part, or all of the codebase would suffer severely. The term refers to the fact that if these developers were unable to work on, or consult for, a project it would be difficult (or impossible) for new developers to pick up where they left off. In other words, if the developers were hit by the proverbial bus, the project would be in jeopardy. High bus numbers are good (with the best case being equal to the number of developers on a project). This means all developers understand the codebase more or less equally. A low bus number (especially, one) represents a high risk.

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