Changes to the Knowledge Base are managed by a revision control system. Each set of changes is tracked with a revision number, author and date/time of change recorded.
Revision control is the key feature that enables the organization to extend broad membership in the team able to directly change the Knowledge Base. Being able to track and role back errors is key to the multi authorship environment.
An additional aspect of revision control is the ability to register for email notification of changes and content. This allows the subject experts, usually called Contributing Editors, to perform a review role on content submissions.