What is premortem?
A premortem is a planning exercise where you assume the project has already failed — completely — and write the story of why. Invented by psychologist Gary Klein, it flips "what could go wrong?" (which invites optimism) into "it went wrong: what happened?" (which invites honesty).
Why it matters
Teams are bad at criticizing a plan they've just committed to; imagining the failure as an accomplished fact gives everyone permission to say the quiet thing. Research on prospective hindsight shows it significantly increases the number of real risks people can name.
An example
Before a product launch, the team writes: "It's six months later and the launch flopped. What killed it?" Answers surface fast — the checkout flow nobody tested on mobile, the one engineer who owns deployment going on leave, the price nobody validated. Each becomes a fix before launch, not a postmortem finding after.
How to practice it
Before your next commitment, set a 10-minute timer and write the failure story dated one year from now — specifics only. Too Hard Pile has both premortem drills and a free premortem tool in its Decision Toolbox you can run on a real decision right now.
📖 Practice this model in a story — The Group Project
Reading about mental models doesn't build the reflex — reps do. Too Hard Pile schedules each drill back with spaced repetition so the model is there when a real decision needs it.