One team can run a base on goodwill and a shared understanding of what belongs in it. A whole organization cannot, and the three things that break at that boundary are not features. They are the vocabulary, the ownership across departments and the question of who decides when two teams disagree about what the answer is.
The vocabulary stops being shared
Two departments use the same word for different things and different words for the same thing, and both are right inside their own walls. The fix is not a glossary project; it is titling articles in the reader's words and letting the body carry the internal terms so search finds them either way.
Ownership has to cross a reporting line
Within a team, chasing an overdue article is a conversation. Across departments it is a request with no authority behind it, and it fails silently. The answer is a named executive who receives the overdue list by team each quarter, which converts a favor into an expectation.
Two teams give different answers to one question
Usually because both are right about their own part and neither can see the whole. Name in advance the role that decides, normally the owner of the underlying process rather than the owner of the base, and write the decision into the article rather than letting it say both things.
What does not change
An owner per article, a review date with a consequence, the answer in the first paragraph, and titles in the asker's words. The discipline at organizational scale is the same discipline; what changes is that it now needs authority behind it rather than agreement.
Questions people ask about organizational knowledge management
One base or one per department?
One base with clear categories, in almost every case. Departmental bases mean a reader has to know which department owns the answer before they can search for it, and that is exactly the knowledge they lack.
Does this need a central team?
It needs one person, not a team. Central teams in this area drift towards writing articles themselves, which produces pages the business does not believe and owners who feel relieved of the job.
How do we handle confidential material?
By keeping it out rather than by building elaborate permissions. A base whose value is a single searchable surface loses most of that value the moment half of it is invisible to half the company.