When it comes time for students to peer edit in my classroom, every student "RAINBOW edits" a friend's paper. The idea is that students use all of the colors in the rainbow to edit certain parts of someone else's writing piece. The students really enjoy using it and marking up their partners paper (which is what I want them to do!!). I have them check with me when they are finished. It is very easily to tell if students have put thought into the peer editing process by looking for all colors of the rainbow! Enjoy! :)
I also have RAINBOW Edit sheets for other types of writing available for purchase!