Doctors perform a post-mortem to learn why a patient died. Businesses do something similar after a failed project: they gather, look back and list what went wrong. The trouble is timing. By the time anyone asks the question, the money is spent.
The pre-mortem moves the question to the beginning. The psychologist Gary Klein popularized the technique: before committing to a plan, imagine that it is a year from now and the plan has failed completely. Then ask, "What happened?"
Why it works
When a team is excited about a plan, raising doubts can feel disloyal. People who see problems stay quiet. A pre-mortem changes the social rules. It does not ask "Is anything wrong with this plan?", which invites polite silence. It assumes failure as a fact and asks everyone to explain it, which invites creativity. Suddenly, finding the weak spot is the assignment, not an act of disloyalty.
It also works on the lone owner. Excitement narrows attention: we see the reasons a plan will work and skim past the reasons it will not. Writing the story of the failure forces the mind to look where it would rather not.
How to run one in twenty minutes
The owner may still decide to proceed. But now the decision rests on a clearer picture.
What it is not
A pre-mortem is not pessimism, and it is not a vote on whether to go ahead. Most plans survive their pre-mortem, stronger than before. The point is not to kill ideas; it is to stop paying full price for lessons you could have learned for free.
Pair it with two other guardrails.
A pre-mortem works best alongside a short checklist answered before you commit money or time (What problem are we solving? What will it cost? When will cash arrive? What would make us stop?) and the outside view: asking how plans like yours have usually turned out, rather than trusting only the details of your own story.
Practice the habit.
GSU's free What If Machine lets you follow the branching consequences of a decision before you make it, a pre-mortem you can play. The Entrepreneurship page adds the numbers: a cash simulator, the Owner's Forecast, and a free certificate exam.
The pre-mortem is one of three guardrails described in Chapter 4, Your Brain on Uncertainty, in the forthcoming GSU book From Risk to Reward: Decoding the Entrepreneurial Mindset by Dr. Gene A. Constant.
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