Coaching practices for Conjunction Error Probability
Describe almost anything you are working through and IX Coach finds the practices whose real-world fit is closest. For Conjunction Error Probability, these are the strongest matches in the current practice library.
Does this sound like the set of challenges you might be facing?
- When two things fit together neatly in my head, I treat the whole package as more likely than either piece alone
- My plan only works if a whole chain of things all go right
- I’m betting on "this will happen and then that will follow," and the link between them feels airtight to me
- Because I can explain exactly why something would happen, I treat it as likely to happen
- I’ve lived inside this scenario so long that every piece feels obvious to me
Practices that may help
- Test each component probability separately
Before judging a joint claim, estimate each element on its own, then check whether the conjunction is lower.
The Conjunction Fallacy — When "More Details" Feels More Likely - The Conjunction Fallacy — When "More Details" Feels More Likely
The conjunction fallacy is the well-replicated tendency to judge a specific combination of events as more probable than one of its components alone — made famous by Kahneman and Tversky’s Linda problem. It happens because vivid, representative details hijack probability judgment, and the fix is to reason about base rates rather than narrative fit. - Audit plans for scenario inflation
Before committing to a plan that depends on multiple things going right, count the dependencies.
The Conjunction Fallacy — When "More Details" Feels More Likely - Red-team joint scenarios before betting on them
Before acting on a conjunction ("X will happen AND Y will follow"), assign a skeptic to attack the "and."
The Conjunction Fallacy — When "More Details" Feels More Likely - Explicitly distinguish coherence from probability
A story can be internally consistent and still be rare — learn to separate "makes sense" from "likely."
The Conjunction Fallacy — When "More Details" Feels More Likely - Consult an outside observer to counteract narrative pull
Describe the scenario to someone who doesn’t share your narrative context and listen to their probability estimate.
The Conjunction Fallacy — When "More Details" Feels More Likely - Anchor on base rates before adding details
Start with how common the outcome is in the relevant population, then update — don’t start with the story.
The Conjunction Fallacy — When "More Details" Feels More Likely - Strip the narrative and restate as a bare frequency claim
Translate the vivid scenario into a dry statistical question to see if it still feels probable.
The Conjunction Fallacy — When "More Details" Feels More Likely - Interrogate whether similarity is doing the work
When assessing probability or quality, ask whether you’re really judging similarity to a prototype.
Attribute Substitution: When Your Brain Answers a Different Question - Count the assumptions each explanation requires
When two explanations fit the facts, count how many unverified assumptions each one rests on.
Occam’s Razor: Prefer the Simpler Explanation
Related concerns
- The Conjunction Fallacy When More Details Feels More Likely After A Setback
The conjunction fallacy is the well-replicated tendency to judge a specific combination of events as more probable than one of its components alone — made famous by Kahneman and Tversky’s Linda problem. It happens because vivid, representative details hijack probability judgment, and the fix is to reason about base rates rather than narrative fit.
- The Conjunction Fallacy When More Details Feels More Likely At Work
The conjunction fallacy is the well-replicated tendency to judge a specific combination of events as more probable than one of its components alone — made famous by Kahneman and Tversky’s Linda problem. It happens because vivid, representative details hijack probability judgment, and the fix is to reason about base rates rather than narrative fit.
- Conjunction Fallacy Practice
Before judging a joint claim, estimate each element on its own, then check whether the conjunction is lower.
Test each component probability separately
- Coherence Vs Probability
A story can be internally consistent and still be rare — learn to separate "makes sense" from "likely."
Explicitly distinguish coherence from probability
- Conjunction Planning Error
Before committing to a plan that depends on multiple things going right, count the dependencies.
Audit plans for scenario inflation
- When Conjunction Fallacy Decompose Conjunctions
Before judging a joint claim, estimate each element on its own, then check whether the conjunction is lower.
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