| Known-Knowns | Things we're aware of and understand. We know that we know. |
| Known-Unknowns | Things we're aware of but don't understand.
We know we don't know. |
| Unknown-Knowns | Things we understand but are not aware of.
We know but don't know it's relevant. |
| Unknown-Unknowns | Things we're neither aware of nor understand.
We don't know what we don't know. |