Bus factor
Bus factor is the minimum number of key contributors whose unavailability would seriously impair a project or make essential work difficult to continue or maintain.
Machine Learning System Design
Bus factor is the number of key contributors whose loss could prevent a project or system from continuing effectively.
- How it is used
- Guides ownership and maintenance decisions by exposing how dependent a project is on particular contributors.
- How deep it goes
- Defines a count-based risk metric, explains its efficiency-redundancy tradeoff, and qualifies it with partial knowledge and contextual judgment.
- Examples
- Uses bus-factor values of 1 and 10,000, plus reviews, pairing, open hours, and documentation as risk-management examples.
- What you can do after
- Diagnose ownership fragility, calculate a project bus factor, and select knowledge-sharing or staffing responses.
Read how Machine Learning System Design explains bus factor →
"Looks Good to Me"
The minimum number of knowledgeable team members who would have to become unavailable before a project stalls because of insufficient knowledge.
- How it is used
- Evaluates a team’s dependence on specific developers and motivates knowledge-sharing practices.
- How deep it goes
- Defines the risk and recommends several knowledge-sharing practices without providing a measurement formula or checklist.
- Examples
- Uses code reviews, team meetings, informal discussions, and pair-programming sessions as knowledge-transfer examples.
- What you can do after
- Apply it through code reviews and shared-development practices to build a more resilient, competent, and cohesive team.
Related concepts
- performancekind of · Performance is the measurable effectiveness or operational behavior of a system under specified conditions, assessed through relevant qualities such as task results, speed, responsiveness, throughput, or resource use.
- riskmeasures · Risk is the possibility and potential impact of an adverse outcome arising from uncertainty.
- knowledge transferaddressed by · Knowledge transfer is the conveyance or application of information, skills, or learned capabilities from one person, system, task, or context to another.
- single point of failureaddresses · A single point of failure is a component, dependency, person, or condition whose failure can prevent a system or critical capability from functioning because no adequate alternative is available.
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