1. Home
  2. Free courses
  3. Thinking Lab
  4. Mental models
  5. Premortem

Mental model · Deciding

Premortem

Premortem: Imagining a failure has already happened so the reasons become sayable. For each cause: prevent it, detect it early, or accept it.

Free — no account needed to read

Imagining a failure has already happened so the reasons become sayable.

Try it now

Assume the plan you are committed to failed completely. Write the story of how, in sequence, with specifics.

What to do with the answer

For each cause: prevent it, detect it early, or accept it. Write what the earliest visible sign would be.

Where it misleads

It surfaces failures you can imagine. The ones you cannot are why the bad case still has to be survivable.

The module it belongs to

  • Decision Thinking — Make better decisions under uncertainty

The book behind it

  • Sources of power — Its big ideas, in our own words.

Previous: Circle of competence

Next: Sunk cost

This is part of Thinking Lab, a free course on My Full Journey. Reading every lesson is free with no account. A free account adds saved progress, private answers and practice with your own life in Thinking Lab. See every free course.