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Ben, the TA, can access a summary of all problem sets for a particular user (their grades) or for himself (grading statistics). Ben can also add a new assignment, specifying the title, due date, the assignment file, and any test cases that would auto-grade the students' submissions. Ben also has the option to publish this assignment to the students and release grades after they've been completed. In addition, TAs can post updates to problem sets, along with a message.
Alyssa is a student, and she can view assignments and submit her solutions. She can download the assignment files, upload a submission, and view her own grades as well as the class grade histogram.
Design 2
