In a wiki space there are several types of users:

• readers: visitors of the space, they can view all or some content, but they can not edit it!. However readers are authorized to post their feedbacks and points of view through the add comment function.

• contributors : can view and edit all or some content. Contributors are invited to add new content and to enrich the content of their colleagues.

• coordinators : can view, edit and delete the content. The coordinator role is crucial for the space life and for a successful collaboration. To participate (contribute) in a wiki space, a user has to get the necessary access rights

• The wiki administrator is in charge of the platform management.