1: Anonymous user
The lowest tier of security is an anonymous user, who can only access collections visible to everyone. This user cannot access any of the other features of the site.
2: Registered user
A registered user can access content available only to certain groups, as well as receiving subscriber feed but still cannot submit.
A submitter can contribute to the site by submitting documents themselves, which will await moderation by a higher level admin. These are nominated by higher level users.
4: Collection owner
A collection owner nominates submissions, maintains a collection, and can also submit items to collections.
An administrator has access to all privileges and can approve and submit items themselves, customise parts of the site, change the names and details of projects and researchers, and approve and nominate submitters.