The designation of students as full or part time is necessary for the regulations governing tuition charges, student fees, statistical records, time limits for degrees, residence requirements, and any other issues affected by such status. A student registered for 12 or more credits has full-time status; a student registered for 11 or fewer credits has part-time status. In addition to regular course work, the following also are included in the calculation of credits: research courses, regular courses taken "not-for-credit," and graduate and teaching assistantships (usually 6 credits each). Graduate and teaching assistants must remain in good standing in their own programs. In addition to their half-time academic appointments, assistants are required to register for a minimum of 6 credits of course work or research, thereby qualifying for full-time status.