Be able to show the document with, for all deferences with the previous version, another background. Easier to see that all the modification and more clear . Helpful if we use a Wiki for ISO documents.
For example we have a "process description" for our employee and we make some change in the process (just changing some sentences.
Actually, we have to inform all our employee that this process has change and they have to read it completely.
The best way is to highlight automatically the differences between the actual and the previous version.