The student will have to do some research under the guidance of the professor. Most of the students are offered a RA of 20 hrs/week or 10hrs/week after they arrive at the university or in their 2nd or 3rd semester. It is offered to a student by any professor, who wants that particular student to work for his research. With RA, the students are offered a tuition waiver which would help them waive off their tuition fee almost entirely. But still there is a nominal amount that needs to be paid by the students.