Create a wiki having following feature.
* Three user group each group should be able to read/write in a particular area of wiki.
* file uploading and version control
* wysiwyg editor
* sysop should be able to add new user to any group
Stages of work
* Select the software in which you want to implement this wiki ( i prefer meadiawiki but i am open to other options)
* install That software on server
* Demonstrate a working sample.
I look forward to get a proposal