For students appointed as part-time Teaching Assistants. Part-time TA appointments (half-time for a semester or year) are not generally offered by the SC&I doctoral program, but may occasionally become available.  Credits for a Teaching Assistantship do not count towards doctoral degree requirements.  The credits enable a student's transcript to reflect that this experiential learning was part of their doctoral study, and factor into the number of credits needed to be considered a full-time student.