Manager-Decides what is to be reviewed?Ensures sufficient time is allocated in project plan for all the review activities if objectives have been met.
Moderator-sometimes known as review leader. Leads review of doc; plans review meeting, follow up after review and decides when to release the doc finally.
Author-Person whose doc is being reviewed
Reviewer-Person with technical or business background who reviews the doc.
Scrib- Who documents all reviews and open point discussions in each review meeting.