The term traditional taekwondo typically refers to martial arts practiced 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 practiced its own style of martial arts. 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 studied 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 Federation 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.