This is a cover sheet for returning an IB Paper 2 essay.
The first page reminds students what their essay should include (introduction, body, conclusion), and includes space for positive and constructive feedback.
The second page breaks down the IB grade descriptors into comprehensible language, and indicates what letter grade the student's IB score corresponds to.
Finally, there is room for a final letter grade and an explanation.
This rubric may also be handed out while the student is completing the essay—I have found it especially helpful to ask students to grade their own work, and to justify their self-assessment before turning in their work.