Workgroups DaVinci makes it easy to add Reviewers to a proof, even if they are not Workgroups DaVinci users. We call them "Anonymous Reviewers."

To add an anonymous reviewer, open the proof and in the sidebar click Review.
Then click Assign reviewers.

In the dropdown box, type in the email address of your Anonymous Reviewer and click Invite.

The reviewer will now receive an email and can click on the Open File button to review the proof!