philosophy. 1946: Traditional Taekwondo The term traditional Taekwondo typically refers to martial arts practised in Korea during the 1940s and 1950s by the nine original kwans, or martial arts schools, after the conclusion of the Japanese occupation of Korea at the end of World War II. The term Taekwondo had not yet been coined, and in reality, each of the nine original kwans practised its own style of martial art. The term traditional Taekwondo serves mostly as an umbrella term for these various styles, as they themselves used various other names such as Tang Soo Do (Chinese Hand Way), Kong Soo Do (Empty Hand Way) and Tae Soo Do (Foot Hand Way). Traditional Taekwondo is still practised today but generally under other names, such as Tang Soo Do and Soo Bahk Do. In 1959, the name Taekwondo was agreed upon by the nine original kwans as a common term for their martial arts. As part of the unification process, The Korea Taekwondo Association (KTA) was formed through a collaborative effort by representatives from all the kwans, and the work began on a common curriculum, which eventually resulted in the Kukkiwon and the Kukki Style of Taekwondo. The original kwans that formed KTA continues to exist today, but as independent fraternal membership organizations that support the World Taekwondo and Kukkiwon. The kwans also function as a channel for the issuing of Kukkiwon dan and poom certification (black belt ranks) for their members. The official curriculum of those kwans that joined the unification is that of the Kukkiwon, with the notable exception of half the Oh Do Kwan which joined the ITF instead and therefore uses the Chan Hon curriculum. 1966: ITF/Chang Hon-style Taekwondo International Taekwon-Do Federation (ITF)-style Taekwondo, more accurately known as Chang Hon-style Taekwondo, is defined by Choi Hong-hi's Encyclopedia of Taekwon-Do published in 1983. In 1990, the Global Taekwondo Federation (GTF) split from the ITF due to the political controversies surrounding the ITF; the GTF continues to practice ITF-style Taekwondo, however, with additional elements incorporated into the style. Likewise, the ITF itself split in 2001 and again in 2002 into three separate federations, headquartered in Austria, the United Kingdom, and Spain respectively. The GTF and all three ITFs practice Choi's ITF-style Taekwondo. In ITF-style Taekwondo, the word used for "forms" is tul; the specific set of tul used by the ITF is called Chang Hon. Choi defined 24 Chang