It may be a little passe, but the Johari window in its many re-incarnations, remains a useful reminder when looking at personal or organizational knowledge.
There are a number of variations depending on where you are coming from e.g. this next one that considers
Modes of discourse
or this more common 2 x 2 matrix that looks at:
Knowledge and certainty
KK = what you know you know
KDK = what you know you don't know
DKK = what you don't know you (already) know
DKDK = what you don't know, you don't know
There sure is something elusive, futuristic and a little scary about contemplating what you don't know, you don't know. This is the provenience of environmental intelligence, awareness, discontinuous change, weak links and left field emergence. The window you need to pay most attention to if you are not to be caught napping - reflection of a very different kind.