Bus factor is the minimum number of team members whose sudden absence — hit by a bus, in the dark joke that gives the term its name — would seriously disrupt the team's ability to operate. A team with a bus factor of one has a single person whose disappearance would cripple the work.
Bus factor measures concentration of knowledge, ownership, and authority. It is distinct from team size. A team of ten people can have a bus factor of one if a single individual holds disproportionate context. A team of three can have a bus factor of three if knowledge is well distributed.
Raising bus factor is a structural exercise: pair on critical systems, write down decisions, distribute authority, and avoid hero-engineer dynamics that concentrate context in one place.
Why Bus factor Matters for Distributed Teams
Most teams have a worse bus factor than they realize. The discovery often comes at the moment of failure: someone leaves, and operations stall.
Auditing bus factor before it matters — and investing to raise it — is one of the cheapest forms of organizational resilience.
Frequently Asked Questions
What is bus factor?
Bus factor is the minimum number of team members whose sudden absence would seriously disrupt the team's work. It measures concentration of knowledge and authority. A team with a bus factor of one is fragile, regardless of size.
Related Terms
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See bus factor in action.
StandIn is built around these concepts. Engineers publish declared state before going offline. The next shift starts with full context.