Finding your bus factor: skills coverage for managers
"Bus factor" is the grim engineering joke with a serious definition: how many people can your team lose before a critical function has nobody left who can do it? For most teams, for at least one function, the answer is one — and the manager usually learns which function from a resignation letter.
Why org charts hide this
An org chart shows reporting lines, not capability. Two teams of eight can look identical while one of them has payroll, the deploy pipeline, and the biggest customer relationship all resting on the same person. Headcount planning that only looks at boxes and salaries will happily "optimize" that person away.
The exercise: functions, not job titles
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List your critical functions. Not roles — functions. "Run payroll", "respond to security incidents", "own the Acme account", "approve infrastructure changes". Most teams land on 10–20. Give each a criticality (how bad is a gap?) and a target coverage (how many proficient people should you have?).
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Map proficiency honestly. For each person × function: learning, proficient, or expert — and mark the primary owner. "Learning" deliberately doesn't count toward coverage; aspirations don't answer pagers.
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Read the exceptions. You're looking for three patterns:
- No coverage — a critical function with zero proficient people (it happens more than you'd think, usually after the last reorg).
- Bus factor — exactly one proficient person. Sort by criticality and you have your succession-planning priority list.
- Key-person concentration — one person who is the sole coverage for several functions at once, especially if they're a flight risk with no designated successor.
Make it part of every reorg
The matrix isn't a one-time audit — it's a gate for every planning decision. In OrgPlannerPro, every scenario gets a coverage impact check automatically: flag three people for elimination and the skills panel tells you which critical functions lose coverage, which drop to a bus factor of one, and which are losing their primary owner with no successor designated.
That's the difference between "we cut 8% of payroll" and "we cut 8% of payroll and accidentally 100% of our ability to close the books".
Over-coverage is signal too
The same matrix shows the opposite pattern: six people proficient at a low-criticality function is an investment decision someone made by accident. That's usually where your next stretch assignment — or your backfill budget — comes from.