Some people earn medals to show how they are improving. They dance in front of a judge to earn a medal at the Bronze, Silver, or Gold levels. Ballroom dance teaching and medal awards is done by Dance Teacher organisations, such as the Imperial Society of Teachers of Dancing (ISTD) or the International Dance Teachers Association (IDTA). These organisations also do ballet, stage dancing (or 'theatre dance' or 'jazz dance') and several other types of dance. Their qualifications and exams are held world-wide, even though they are English in origin. Street dance, as the name suggests, does not need a ballroom. Nevertheless, it is being taught in ballrooms, as are some other kinds of non-traditional dance.