The knowledge pie

In one paragraph

Three slices. A small one you know. A slightly bigger one you know you don't know. And a vast one you don't even know exists — which is where the expensive surprises live.

K — what you know. The smallest slice, and the one people mistake for the whole pie.

KDK — what you know that you don't know. You are aware of the gap. You know you do not understand VAT on imports, or how to read a balance sheet. Manageable, because you can go and ask.

DKDK — what you don't know that you don't know. By far the largest slice. You cannot ask about it, because you do not know it is there. This is where the rules you did not know applied, the risk you never considered and the opportunity you never saw all sit.

There is much more that we do not even know we do not know than there is that we actually know. That is uncomfortable and it is the whole argument for staying open to new learning.

Why it matters commercially

Most serious business mistakes come out of the third slice, not the second. Nobody plans for what they cannot name. The only defence is exposure — other people, other industries, advisers who see many businesses rather than one.

How to actually use it

• Deliberately talk to someone outside your trade every month. The value is not their answers, it is the questions you did not know to ask.
• When something goes wrong, ask which slice it came from. If it was DKDK, the fix is exposure and advice, not more effort.

Where it breaks down

• It is unfalsifiable by design — you can never measure the third slice — so use it as a posture rather than as an analysis.

More on learning