We evaluate the case for using feedback iteratively, to improve student engagement and learning. In this model, students were invited to respond to tutor feedback with students' own responses. Among the three courses/modules (three tutors) studied, differences in feedback styles were evident from: (a) thematic analysis of tutor comments and, for one course, and (b) comments in a student focus group. Students were inconsistent in their evaluation of tutor feedback but, in a more detailed study of one of the courses, there was clear evidence for the benefits of iterative feedback. Lessons from the main study were then applied to a course that had not previously incorporated iterative feedback. Using this experience, we provide suggestions for applying iterative feedback in assessments.