In a course I teach we do have peer reviews of research papers. I have noticed that even with encouragement from me, many students do not participate. They would rather lose 50% of their grade because they don't want their peers to review their work. I know there are different types of learners, but how can I better show these students the positives of having their peers look at their paper? I have been teaching for years and have yet to have any students be mean or disrespectful when reviewing other student papers. Just trying to find a better approach so that everyone participates.