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Who covers your key roles if someone walks tomorrow?

July 2026 · 6 min read

Every organisation has a handful of people who, if they resigned on Monday, would leave a hole nobody could fill by Friday. Usually everyone knows who they are and nobody has written it down, which means the risk is real but invisible - and invisible risks do not get funded, planned for, or fixed. They just wait.

Succession planning is how you make that risk visible and then shrink it. Most succession files never manage the first part: they are a tidy list of roles and heirs-apparent that grades nothing and warns you of nothing. A useful one does three things - scores the risk, tests the bench, and raises an alarm where the bench is empty.

Key-person risk: two questions, not one

"How critical is this role?" is the wrong question on its own, because it conflates two very different things. Split it. First, business impact: if this person left, how much damage would it do - to revenue, to a key relationship, to knowledge that exists nowhere else? Second, flight risk: how likely are they actually to leave, given tenure, engagement, market demand for their skills and how long they have been in the seat?

A role high on both is a red-alert priority. A role with huge impact but a contented, well-rewarded, unlikely-to-move person in it is a watch item, not an emergency. And a role someone is very likely to leave but which is easy to backfill barely registers. Multiply the two into a key-person risk rating on a simple matrix, and your attention goes where it belongs instead of to whoever shouted loudest.

Impact tells you how much a departure would hurt. Flight risk tells you how soon. You need both, because a critical role with a happy long-server is a different problem from a critical role with one foot out of the door.

Readiness is the honest part

Naming a successor feels like progress and often is not. The question that matters is not "who could take over?" but "could they take over now, and if not, when?" Grade each named successor for readiness - ready now, ready in a year or two, or a longer-term prospect - and the bench stops being a comfort blanket and becomes a plan.

This is where wishful thinking gets exposed. A role with three named successors who are all "ready in three years" is, for any near-term shock, a role with no cover at all. Bench strength should count the people you could genuinely call on soon, not everyone whose name you were able to write in a box. Naming three hopefuls is easy; having one person ready this quarter is the thing that actually protects you.

The no-successor alarm

The single most valuable output is also the simplest: a flag on every critical role with nobody named behind it. This is the quiet risk made loud. It is easy to feel covered because the plan is mostly full and skate past the two rows that are blank - and those two blanks are precisely where a resignation becomes a crisis.

An automatic NO SUCCESSOR flag, surfacing the highest-impact gaps first, converts a passive document into something that demands a decision. You cannot un-see it, which is the point. It forces the conversation about whether to develop internally, recruit ahead of need, document the role's knowledge, or accept the risk with eyes open - all of which beat discovering the gap the day the notice lands.

Turning it into a review

Succession is not a once-a-year form; it is a standing item. Bring the roll-up into every talent review: the count of critical roles, how many carry critical or high key-person risk, how many have no successor, and how many have ready-now cover. Those four numbers are a board-level read on organisational resilience, and they move as you act - developing a successor drops a role's risk, and you can watch it happen.

Keep it grounded. Succession judgements are opinions about named individuals' futures, so treat the file as the personal data it is, review it as circumstances change, and remember it is a planning tool - not a promise to anyone and not employment or HR advice.