Top definition
The number of people on a project that can die (such as being hit by a bus or win the lottery, etc.) without the project losing some critical, un-replaceable ability.
The more people who understand the whole system, the stronger and more resilient your organization.
Mary's website project has a bus count of 1: if the web guy goes, they have to start over.
by murray9 December 17, 2013
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