This rubric covers format, grammar and content requirements for a friendly letter. It is written in a clear, easy to understand manner, making it a valuable self-evaluation as well as teacher-evaluation tool. I recommend giving the rubric to students with the assignment and having them use it to evaluate their own letter.
I have ten years of teaching experience in a variety of high school settings: English 8-12, French 8-10, Career and Personal Planning 8-10, and Special Education 10-12. I have also participated in curriculum development at the district level.