The grandmaster of the dojang is called a gwanjangnim (관장님, gwon'-jong-nim); the master (senior instructor or head of dojang) is called sabeomnim (사범님, sah'-bum-nim); the instructor is called gyosannim (교사님, gyoh'-sah-nim); and the assistant instructor is called jogyonim (조교님, joh'-gyoh-nim).