I use this letter assignment as a get-to-know you activity with my students. They write it at the beginning of the year and I hold on to them until the end of the year. I give them back on the last day of school. It gives kids an opportunity to think about their strengths and weaknesses, and helps them to focus on a goal they would like to reach during the year (academic or otherwise). It's also a great way for me to learn what makes them tick and to hopefully use that to hook them as the year progresses. A basic student-created rubric is included in the document.