A superb AP English Rubric for Writing Assignments that has been approved by both, the College Board and the State of California.
It is divided into the following sections:
The rubric is extremely comprehensive. Take a look at one example of the criteria for the THINKING section.
"Writer generates original ideas, provides a compelling thesis, synthesizes complex concepts, and offers keen insights."
Please forward any questions you may have to my email account: firstname.lastname@example.org