The Curse Of Knowledge In Everyday Speech

Knowing something changes what you can imagine about not knowing it. The effect is persistent, largely invisible from the inside, and responsible for a great deal of unclear communication.

Understanding cannot be set aside on request

Once a concept is grasped, the state of not grasping it becomes inaccessible. You can remember being confused without being able to reconstruct what the confusion consisted of.

This means an explanation is checked against an audience you cannot simulate. It sounds clear because you understand it, which is not evidence about anyone else.

The failure is not carelessness. The information needed to judge the explanation is genuinely unavailable to the person giving it.

Vocabulary is where it shows first

Terms that felt technical when learned become ordinary with use, and the transition passes unnoticed. They then appear in explanations without any signal that they need defining.

Listeners often do not ask, since asking about a word used casually implies a larger gap than they wish to reveal. The confusion accumulates silently.

Naming a term as jargon when you use it costs a few words and gives permission to be unfamiliar with it. That permission is what unblocks the question.

Skipped steps are the deeper problem

Practised sequences compress. Steps that were once deliberate become automatic and stop being represented as steps at all, so they are omitted from descriptions.

The listener then encounters an instruction with a gap in it and cannot proceed, often without being able to say where the gap is. They know only that it did not work.

Watching someone attempt the task reveals the omissions immediately. No amount of reviewing your own explanation will, because the missing steps are missing from your account of it too.

It distorts estimates as much as explanations

Predicting how long something will take for someone else relies on imagining their experience of it. Expertise makes that imagining systematically optimistic.

The expert recalls the practised version and estimates from it, omitting the fumbling that a newcomer will actually encounter. The result is an underestimate.

Asking someone who recently learned the task gives a more accurate figure than asking the person who knows it best.

Feedback is the only correction

Because the deficiency is invisible internally, it can only be found externally. Asking someone to restate the instruction in their own words locates the gap directly.

The restatement should come before the task rather than after the failure. Discovering the omission at that point costs a minute rather than an afternoon.