MENTAL MODEL · M13107

Inversion/Failure Analysis

SystemsHigh supportReverse Thinking

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Updated 2026-08-17

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INTRODUCTION

English translation pending.

CORE DEFINITION

A problem-solving heuristic that approaches a goal from the reverse direction: rather than asking how to reach success, list everything that would guarantee failure and eliminate those paths. The mathematician Carl Gustav Jacob Jacobi summarized the move as invert, always invert, and Charlie Munger carried it into business judgement, pairing it with Gary Klein's pre-mortem, in which a team assumes the plan has already failed and reconstructs the causes. The method works best when failure modes are concrete and enumerable, and it supplements rather than replaces forward planning, because avoiding every possible failure is neither achievable nor desirable.

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

- Generating failure modes: List every concrete behaviour that would make the plan collapse, then remove those. - Running a pre-mortem: Assume the project has already failed and write down the plausible causes before launch. - Auditing decisions: Compare options by their downside first, and only then by their expected upside.

anchor

Anchor fast decisions

Forward planning is anchored on a preferred outcome, so attention filters out the paths that would destroy it. Reversing the question removes that anchor: failure is easier to enumerate than success because it is bounded and concrete, and every item becomes a checkable hazard. Converting vague hope into a short list of avoidable errors also shifts the objective from maximising gain to surviving, which raises the floor of outcomes rather than the ceiling. Because the list is finite, it can be acted on immediately.

MINIMUM ACTION

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Practice this model in one real situation:

Write the goal in one sentence, then invert it into the question of what would guarantee failure. 2. List at least ten concrete failure causes without judging or ranking them yet. 3. Rank the list by likelihood times damage and pick the three most dangerous. 4. Attach one preventive action and one early warning signal to each of the three. 5. Re-check the list at every milestone, since new failure modes appear as the plan evolves.

Check to track your progress (stored locally)

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