Students can learn a lot from peer assessment, whether they look at each other’s written work (papers, lab reports, informal reaction papers); presentations (speeches, panel participation, online discussion facilitation); performances (art, athletics, theatrical musical); or other contributions (group work). The ultimate responsibility for grading remains with teachers, but students can offer all sorts of formative feedback—comments, ratings, completed checklists, assessment against criteria, or hypothetical grading. Some teachers use peer feedback in grade calculations.