From the Hunter College Reading/Writing Center for the CUNY/ACT Basic Skills Tests, this rubric directs those who are grading the (New York City) city-wide exam.
Part of the Mathematical Association of America (MAA)'s Mathematical Science Digital Library (MathDL), this site offers resources for math teachers who want to help their students better communicate as mathematicians. The site includes assessments, rubrics, sample assignments, and things that teachers might consider before adding a communication component to their math classes.
By the Council of Writing Program Administrators (WPA), April 2000; amended July 2008. From the Introduction: This statement describes the common knowledge, skills, and attitudes sought by first-year composition programs in American postsecondary education."