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The Lexicon · a working instrument

A mental map of how thinking works, breaks and gets better.

Your mind takes shortcuts. Some save time. Others leave you defending a decision long after the evidence has changed.

631 connected concepts across biases, effects and tools. Explore 203 now, with more countermeasures added regularly.

Read today's conceptFalse Uniqueness BiasExplore the map →
Today's correction

False Uniqueness Bias

We underestimate how common our positive traits and abilities are, believing we are more unique than we actually are.

Read the correction →
Refreshes dailyFull write-up · sources · audit prompt

The field

Five volumes. One connected map.

Every concept sits in a volume and connects to the ones near it. Follow the connections, not a table of contents.

VOL I18/155

The Individual

VOL II2/147

The Group

VOL III0/91

The Body

VOL IV2/133

The World

VOL V0/105

The Toolkit

Open the full interactive map →

The signal

22 corrected, and live right now.

Each one has the full write-up: the mechanism, the sources, and a ready-to-run prompt for auditing your own decision. The rest of the 631 are plotted and waiting their turn.

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  1. #001Affect HeuristicVOL I
  2. #009Bias Blind SpotVOL I
  3. #020Fluency EffectVOL I
  4. #023Fundamental Attribution ErrorVOL I
  5. #026Hindsight BiasVOL I
  6. #030Introspection IllusionVOL I
  7. #034Narrative FallacyVOL I
  8. #038Outcome BiasVOL I
  9. #053Action BiasVOL I
  10. #066Hyperbolic DiscountingVOL I
  11. #069Omission BiasVOL I
  12. #074Plan Continuation BiasVOL I
  13. #080Regret AversionVOL I
  14. #109Self-serving BiasVOL I
  15. #110Sunk Cost FallacyVOL I
  16. #114Present BiasVOL I
  17. #137Curse of KnowledgeVOL I
  18. #141Illusion of TransparencyVOL I
  19. #212Duping DelightVOL II
  20. #276Survivorship BiasVOL II
  21. #435Loss AversionVOL IV
  22. #468Halo EffectVOL IV

How it works

Named, corrected, connected.

  1. STEP 01

    A named failure

    Each entry is one specific way good thinkers reach wrong conclusions — named, so you can spot it in the wild.

  2. STEP 02

    The countermeasure

    Every correction ends with the move that interrupts the pattern: what to check, and a ready-to-paste prompt for running that check on your own decision.

  3. STEP 03

    A growing map

    New full corrections keep landing at a steady pace. Subscribe and the map fills in around you over time.

The weekly concept

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No filler. One concept, how it works and what to do about it. Free.

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  • Every claimsourced

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22 corrected so far · 631 mapped · unsubscribe anytime