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What is a pre-mortem? A practical introduction
Why imagining failure helps you see risks more clearly - and how to run your first pre-mortem in an hour.
Published 18 Oct 2026
Most business planning is written from the perspective of success. A pre-mortem flips that perspective: you imagine that your business has already failed and ask why.
Why it works
When failure is treated as a fact rather than a possibility, people find it easier to name risks they would otherwise keep to themselves. The exercise turns vague worries into concrete, discussable causes.
Running your first pre-mortem
- Describe your business model in a few sentences.
- Set a horizon - three years is a useful default.
- Write a short story of how the business failed.
- List every cause you can think of.
- Rate each cause for likelihood and impact.
- Pick the top three and define one preventive action for each.
What to avoid
- Debating causes before everyone has written theirs down.
- Treating scores as precise predictions.
- Producing a list and never looking at it again - set a review date.
Demonstration article - to be replaced or approved by the author.