Over documenting quality systems has been a real problem; almost as nocive as under documenting it.
How to choose which information to document then? Over documenting is easy, because you try to write all that is done. BAM, easy.
I guess the answers come with your QMS improvement, but when you try to implement a system from scratch (like I’m doing now), it's easy to be lost in the documents you need to have or don't.
I try to think as: is there a risk that it will not be done correctly? If yes = document it.
Does only 1 person know how to do X? If yes = document it.
(EDIT) Also: Is there often a loss of time because this action has been done incorectly, poorly, etc? If yes = document it.
I hope it'll work for the auditors.
Soad