NoRedInk Writing requires students to master skills prior to rating their classmates' work. Skill mastery helps ensure that students are well-informed, accurate, and direct peer raters, and that the feedback they leave is both actionable and accurate.
As an example, say that you want students to rate each other's thesis statements along two criteria: Facts vs. Opinions and Wordy vs. Concise. In order for a given student to provide feedback on those criteria, he must master the topics associated with each criterion. For Fact vs. Opinion, there is one associated topic he needs to master. For Wordy vs. Concise, a more nuanced and complex concept, there are 6 associated topics he must master.
NoRedInk provides a differentiated experience, such that each student rates along those criteria he or she has mastered. If you assign both Fact vs. Opinion and Wordy vs. Concise like in the example above, students will rate each other along 0, 1, or both of these, depending on their current level of mastery.