Revision control 
TWiki has "soft security" - anyone can change anything, but changes are logged. There is a complete audit trail: 
-  Version
-  Date of last revision
-  Person who made change
 
is recorded. At the footer of each topic one can access previous versions, as well as differences between revisions by clicking on the 
> sign located between revisions of a topic.
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Contributors: TWiki:Main.PaulineCheung