Key-person risk means critical work depends on one person. The bus factor measures it: the number of people who would have to disappear before work stops. Find it by mapping each critical topic to the people who understand it. Any topic with one name needs a second person, written decisions and introduced relationships.
Key-person risk vs bus factor
| Term | Used in | Meaning |
|---|---|---|
| Key-person risk | Business, finance, insurance, investment | Dependence on specific individuals |
| Bus factor (or truck factor) | Software and project teams | How many people can disappear before work stalls |
| Single point of knowledge | Knowledge management | A topic only one person understands |
How to find your single points of knowledge
Step 1: List critical topics
Systems, customers, processes, regulatory obligations, suppliers, budgets.
Step 2: Map people to topics
| Topic | Who understands it well | Who partly understands it | Bus factor |
|---|---|---|---|
| Payroll run | A | B | 1 |
| Key customer X | C | 1 | |
| Billing system | D, E | F | 2 |
Step 3: Rate impact
For each topic with a bus factor of one, ask: if this person were unavailable tomorrow, what breaks, and how soon?
Step 4: Prioritize
High impact plus bus factor of one goes first.
How to reduce key-person risk
- Pair. Assign a second person to each high-risk topic and have them do the work regularly.
- Write down decisions. The why is what a second person most lacks.
- Introduce relationships. A customer who only trusts one person is a risk until they trust two.
- Rotate. Short rotations spread knowledge.
- Plan succession for roles where a vacancy would hurt most.
- Use handovers for leave, not only for exits. A two-week holiday is a good rehearsal.
Signs of hidden key-person risk
- "Ask [name]" is the answer to many questions.
- One person is copied on everything.
- Work slows when a specific person is on leave.
- Nobody else can explain why a system or process is set up the way it is.
Where Reattend fits
Mapping topics to people by survey is slow and quickly out of date. Reattend's dashboard shows topics only one person holds, based on the organization's memory, alongside their open commitments and who is best placed to take over. It shows where knowledge is concentrated as topic names and counts, without opening the items behind them.
Frequently asked questions
What is key-person risk?
Key-person risk is the risk that an organization cannot operate normally if a specific person leaves, falls ill or becomes unavailable, because critical knowledge, relationships or decisions depend on them.
What is the bus factor?
The bus factor is the smallest number of people who would have to become unavailable before a project or team stalls. A bus factor of one means a single person holds critical knowledge.
How do you reduce key-person risk?
Map critical topics to the people who understand them, pair a second person on every topic with one expert, document decisions and processes, transfer relationships through introductions, and plan succession for critical roles.
Do investors look at key-person risk?
Often, yes. Investors and acquirers commonly ask how dependent a business is on its founders or a few experts, and some take out key-person insurance.