Have students do the reflecting. I use this project at the end of the semester with my Seniors. The students collect their essays throughout the semester (a great way to motivate them to write essays, and work towards improvement), and go through them at the end of the semester. My students spend the last week before the Final Exam just writing this essay on how their writing proves that they have grown. The directions to this assignment are complete and can simply be passed out to the students to leave them to their own discovery.