Curse of Knowledge
Once you know something, it becomes very difficult to imagine what it’s like not to know it, which quietly sabotages how experts explain, document, and onboard.
What Is It?
Economists Colin Camerer, George Loewenstein, and Martin Weber gave the effect its name in a 1989 paper studying markets, showing that better-informed participants couldn’t fully set aside their own knowledge when predicting how less-informed participants would behave, they overestimated how much others already knew. Elizabeth Newton later produced a simpler and now-famous demonstration of a closely related communication problem: she had one group of people tap out the rhythm of well-known songs on a table while a second group tried to guess the song from the tapping alone. Tappers predicted listeners would guess correctly about half the time. Listeners actually guessed correctly about 1 in 40. The tappers couldn’t help hearing the song in their heads as they tapped, and couldn’t imagine what the tapping sounded like without it.
Why Does It Matter?
Every organization runs on people who know more explaining things to people who know less: onboarding documentation, internal wikis, training, leadership communicating strategy down through layers of hierarchy. The curse of knowledge creates a paradox: the person best equipped to write the explanation may also have unusual difficulty judging what a newcomer won’t understand. Documentation gets written in the vocabulary of the writer, not the reader. A leader announcing a strategic pivot skips the reasoning steps that feel obvious to them but aren’t yet visible to anyone else, and is then baffled that people don’t understand or trust the decision.
What Changes Once You See It?
You stop assuming that clarity is something you can judge from the inside of your own expertise. You start testing explanations on someone who genuinely doesn’t have the context, not someone who’s just being polite about following along. You get more suspicious of documentation, onboarding material, or leadership communication that was never actually reviewed by someone new to the subject before it shipped.
Common Misunderstandings
- It is not the same as being a bad communicator in general. Extremely skilled communicators are still vulnerable to this specific bias, because it isn’t simply a communication-skill problem; knowing something changes what feels obvious and therefore what you realize needs explaining.
- It doesn’t mean experts should avoid explaining things themselves. It means the explanation needs a check from someone without the expert’s background before it’s trusted.
- It is not limited to technical or specialized knowledge. It applies just as much to organizational context, the unspoken history, relationships, and politics a longtime employee takes for granted and a new hire has no access to.
- It isn’t fixed by adding more detail. Over-explaining from inside the same blind spot doesn’t help if the added detail still assumes the reader already has the underlying context.
Diagnostic Question
Has anyone without your specific background actually tried to follow this explanation, or has it only ever been reviewed by people who already understood it before they read it?
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Origin
Colin Camerer, George Loewenstein, and Martin Weber, “The Curse of Knowledge in Economic Settings: An Experimental Analysis,” Journal of Political Economy, 1989. The tapping-and-listening demonstration is drawn from Elizabeth Newton’s 1990 Stanford dissertation research, later popularized by Chip Heath and Dan Heath in Made to Stick.