We use SharePoint for revisions for casual documents and another CM system for tracking releases of official documents. The CM system is meant really for CAD mo

We use SharePoint for revisions for casual documents and another CM system for tracking releases of official documents. The CM system is meant really for CAD models but it lets you upload Word docs that it displays as PDFs with watermarked revision information so you have to have a revision table at the front of the document for listing changes. The SharePoint system is a lot easier to use but you don't get the same sort of change approval system since anyone can edit. Instead we use multiple folders for WIP, waiting for QA approval, and final versions. We have to follow ISO 9001 but anything developmental or that is just derivate of documents in the CM system can live on much more casual systems like git, SVN, or SharePoint.