The Assign TAs tool is one of the ways to assist in setting up grading permissions and workflows if you have TAs assigned to your course. Assign TAs can help set many permissions but permissions require further attention in specific tools.
Assign TAs can work with the roster by identifying specific seminars associated with the class or it can connect a TA to the whole class.
If you want TAs to mark in Tests and Quizzes you must enable this tool and grant TAs access to some part of the class.
Assign TAs to the course
Assigning TAs to the -LEC, -BLD, -WWW section will grant the TA access to grading and viewing all students in the course. This can be beneficial when marking Tests and Quizzes on a question by question basis in Tests and Quizzes, or so that assignments can be randomized for grading or if forums are posted as anonymous in the course.
TAs can also be assigned to specific groups, including official rosters for seminar or tutorials or instructor generated sections following the same move to the right side box for each seminar (see image above).
Note that Permissions in Assignments might need further attention through the "Permissions" tab at the top of the page. The standard for ensuring TAs have grading permissions is to select: "Submit to Assignment", "Read Assigment(s)", and "Grade Assignment submission(s)".