In my experience self-assessments and peer-assessments are challenging requests for students, mainly because they do not have the acumen to provide the necessary feedback to succeed in assignments. For peer reviews of rough drafts I always provide an extensive checklist of criteria that I will use to grade students' final drafts. Every semester there is a group of students that go through the motions during the peer reviews, so they are unpleasantly surprised when final drafts are returned to them.
