Expertise Hides Its Own Steps

One of the strange effects of learning something well is that the path into it begins to disappear.

A concept that once required ten steps now feels like one thought.

A programmer sees an error message and immediately suspects three causes. A teacher looks at an equation and no longer notices the background knowledge required to read it. An experienced person says, “It is obvious,” not because the idea is simple, but because the missing steps have become automatic.

Expertise compresses.

That compression is useful when doing the work. It can be terrible when explaining it.

The person listening does not necessarily lack intelligence. They may simply lack one invisible intermediate idea that the speaker stopped noticing years ago.

This is why explanation requires a kind of reverse engineering.

What had to become familiar before this sentence made sense to me? Which term am I using as if its meaning were universal? At what point did I stop needing an example?

The usual question, “Do you understand?” is weak because it places the burden on the listener and often invites a polite yes.

Better questions expose the structure.

What happens first?

Why does this step follow from the previous one?

Can you explain the idea in your own words?

Where does your explanation become uncertain?

These questions are useful because misunderstanding is rarely a single gap. It is often a missing rung in a ladder both people thought was complete.

Good teaching therefore requires more than knowing a subject.

It requires remembering what it was like not to know it.

That may be one reason some brilliant people explain poorly. Their understanding has become so compressed that they can no longer see the path they traveled.

Expertise hides its own steps.

Explanation is the work of making them visible again.