Grading the production process is a very difficult one.
I put together a powerpoint outlining a rubric on how to build a promptbook out of your script.
I grade each student participating in the show (with the exception of ushers) on writing cues down in the margins of their script. In addition, I encourage them to research and write daily rehearsal reflections to engage their learning process.
With Florida Standards on the presentation (editable to fit your own standards)