Roles for Grading short/long answer questions

What would I need to set a role to in order to allow them to grade short & long answer questions? Right now only users with administrator roles seem to be able to manually grade these questions. We have users who need to be able to grade questions in specific series/courses/lessons, but that we do not want to give full permissions to (just viewing and grading). How would I go about doing that?

Still wondering

Following up. Is there anyone who can assist? Even when I change the teacher and manager roles to say they should be able to manually grade, the person with the role can only view answers and not grade them. Any assistance would be appreciated, as our Admins do not have the time to do the manual grading for users who would be teachers or managers (who we do not want to provide admin roles to for other reasons).