This is a rubric that I use for my fourth grade students' writing assignments. Each week, they are to read a book of their choosing and respond to it by writing me a letter. We write our letters in Google Docs and then I respond each week to that student personally. I paste the rubric in the body of my letter as well, so the students can view their progress and understand how I graded their response.
The rubric was somewhat adapted from a reader's response rubric found in a Fontas & Pinnell teaching strategies book.