Pre-mortem: the template, with worked examples
Updated 20 July 2026 · Advisor: Risk Officer
A pre-mortem imagines your decision has already failed — badly — and works backwards to explain why. By assuming failure up front, it surfaces the risks people are reluctant to raise while everyone's still optimistic. Run it before you commit, not after it goes wrong.
Cerno is a private AI boardroom that puts consequential decisions through a structured process — advisor challenge, a recorded vote, risk and confidence scores, and an Executive Decision Brief. The pre-mortem is one of the lenses it applies; here's how the technique works on its own.
What is a pre-mortem?
Coined by psychologist Gary Klein, a pre-mortem is the opposite of a post-mortem. Instead of asking "why did this fail?" after the fact, you ask it before you commit: "It's a year from now and this decision was a disaster. What went wrong?"
The framing matters. Asked to critique a plan directly, people hedge — nobody wants to be the naysayer. Asked to explain a failure that has (hypothetically) already happened, the same people become fluent and specific. You get the real risks, not the polite ones.
When should you use it?
Use a pre-mortem before any decision that is consequential and hard to reverse: a product launch, a key hire, a market entry, a large capital commitment. The test is simple — if an unspotted failure mode would be expensive or embarrassing, spend twenty minutes here first. Skip it for small, reversible calls.
How to run a pre-mortem in 5 steps
- ›Set the scene. State the decision as if it's already been made and has failed: "We shipped, and six months on it's clearly the wrong call."
- ›Everyone writes independently. Each person lists the reasons for the failure — alone, before hearing anyone else, so no one anchors on the loudest voice.
- ›Collect every reason. Pool them without debate. The goal is breadth, not consensus yet.
- ›Cluster and rank. Group the failure modes, then rank by likelihood × impact. The top few are your real risks.
- ›Turn risks into actions. For each top risk, decide: a mitigation, an early-warning signal to watch, or a condition that would stop the decision.
Worked example
You're weighing whether to open a second site. A pre-mortem surfaces the failure modes, and the brief records what to do about them:
Proceed on a staged basis — sign a short lease with a break clause, and hire the site lead before committing to fit-out.
Which Cerno advisor uses this?
The Risk Officer
Risk OfficerIn a Cerno deliberation, the Risk Officer runs the pre-mortem lens: it assumes the leading option has failed, enumerates the failure modes, and ranks them — so the risks are on the record before you commit, each with a mitigation or a stop condition.
Have a decision that's hard to reverse? Put it through the boardroom and let the Risk Officer run the pre-mortem for you.
Run a pre-mortem in CernoFrequently asked
What's the difference between a pre-mortem and a risk assessment?
A risk assessment lists risks and rates them. A pre-mortem is a psychological trick that gets better risks out of people: by assuming the plan has already failed, it gives everyone permission to voice doubts they'd otherwise keep quiet, so you surface the failure modes a checklist misses.
When is a pre-mortem a waste of time?
On small, reversible decisions. Save it for consequential, hard-to-reverse commitments — a launch, a hire, a large spend — where an unspotted failure mode is expensive.
Who should be in a pre-mortem?
The people close enough to the plan to see how it breaks, and ideally at least one outsider who isn't invested in it going ahead. In Cerno, the Risk Officer advisor runs the pre-mortem lens for you.