User Roles Explained

Global Admin

Has complete control over the account and its users. Essentially, they can see all and do all.

Billing Admins 

This person can have any user role on each calendar, but applying this role means they can manage account settings/billing as well. This is a good role to give to someone who doesn’t need to be active in the account but does need to be able to manage the billing details.

Parent Calendar Admins 

For enterprise accounts, this role can do everything on the parent calendar (and all associated child calendars) to which they are assigned.

Editors 

They have all content-related permissions (full read/write access) on the calendars (and associated content) to which they are assigned.

Contributors 

They can view all content on the calendars to which they are assigned. They can create new content items on calendars to which they have access. They have full read/write access on the content items to which they are the content owner. They can edit content items to which they are assigned.

Internal Reviewers 

They can view (read-only access) all content on the CALENDARS to which they’ve been given access, and they have read-only access of those content items, and can add comments or attachments. They can’t create new content items. They can change the content status to Approved, edit their own production tasks, and upload/download file attachments on CONTENT ITEMS to which they are assigned.

External Reviewers 

They can only view (read-only access) content items to which they’ve been assigned. They can’t create new content items. On content items they’ve been assigned to, they can change the content status, edit their own production tasks, upload/download file attachments, and create and reply to comments.

For a more detailed breakdown: http://divvyhq.com/2012/01/user-roles-explained/