Most big decisions are made in a fog of optimism. The deal is exciting, the team is committed, the plan looks clean on the slide. Then reality arrives with its usual questions, and everyone discovers the risks that were obvious in hindsight. The pre-mortem is the simplest tool we know for importing that hindsight before you need it, and it takes about ten minutes.
How it works
The exercise, developed by the psychologist Gary Klein, inverts the usual risk conversation. Instead of asking what might go wrong, which invites polite, low-stakes answers, you declare the failure as fact: it is twelve months from now, the decision went ahead, and it has failed badly. Now everyone writes down, privately, the story of why.
The reframing matters more than it looks. Asking people to critique a live plan asks them to fight the room's momentum and, often, the boss's enthusiasm. Asking them to explain a failure that has already happened makes scepticism the assignment. People who would never volunteer doubts will fluently produce them when the question is not whether it fails but how it failed. Research on prospective hindsight suggests this framing meaningfully improves the identification of real risk drivers.
Running it on a real deal
Take a live example: you are deciding whether to pursue a large contract. The pre-mortem question becomes: it is next year, we bid, we won, and the contract has damaged the business. What is the story? Typical answers surface fast:
- We priced to win and the margin never existed once the true delivery cost emerged.
- The mobilisation stretched our best people so thin that two existing clients quietly left.
- The payment terms drained cash for two quarters and we borrowed to cover payroll.
- The buyer's definition of scope kept expanding and we never invoked the change process.
Notice what those are: not vague risk categories, but specific, checkable failure paths, each pointing to a question you can answer now, before committing. That is the pre-mortem's real product. It converts anxiety into a checklist.
Optimism is a fine fuel and a terrible navigator.
Why we wired it into our products
The pre-mortem is one of the six stages in the reasoning method behind the Deal Desk, our deal desk platform. Every deal the platform assesses is run through a structured version of exactly this exercise: assume the pursuit failed, assume the contract hurt, work backwards to the likeliest causes, then test each cause against the evidence in the documents. The output is a written verdict that includes not just a recommendation but the specific conditions under which you should reverse it.
You do not need software to start, though. Ten minutes, one imagined failure, and honest pens will improve almost any decision you make this quarter. The habit is the point. Judgement, like anything else worth having, is built on purpose.