sequences; the breaking of boards to demonstrate the ability to use techniques with both power and control; sparring and self-defense to demonstrate the practical application and control of techniques; physical fitness usually with push-ups and sit-ups; and answering questions on terminology, concepts, and history to demonstrate knowledge and understanding of the art. For higher dan tests, students are sometimes required to take a written test or submit a research paper in addition to taking the practical test. Promotion from one geup to the next can proceed rapidly in some schools since schools often allow geup promotions every two, three, or four months. Students of geup rank learn the most basic techniques first, and then move on to more advanced techniques as they approach first dan. Many of the older and more traditional schools often take longer to allow students to test for higher ranks than newer, more contemporary schools, as they may not have the required testing intervals. In contrast, promotion from one dan to the next can take years. In fact, some styles impose age or time-in-rank limits on dan promotions. For example, the number of years between one dan promotion to the next may be limited to a minimum of the practitioner's current dan-rank, so that (for example) a 5th dan practitioner must wait 5 years to test for 6th dan. Black belt ranks may have titles associated with them, such as "master" and "instructor", but Taekwondo organizations vary widely in rules and standards when it comes to ranks and titles. What holds true in one organization may not hold true in another, as is the case in many martial art systems. For example, achieving first dan ( black belt) ranking with three years' training might be typical in one organization but considered too quick in another organization, and likewise for other ranks. Similarly, the title for a given dan rank in one organization might not be the same as the title for that dan rank in another organization. In the International Taekwon-Do Federation, instructors holding 1st to 3rd dan are called Boosabum ( ) or assistant instructor, those holding 4th to 6th dan are called Sabum ( ) instructor, those holding 7th to 8th dan are called Sahyun ( ) or master, and those holding 9th dan are called Saseong ( ) or grandmaster. This system does not, however, necessarily apply to other Taekwondo organizations. In the