The twelve seitei-gata are standardised for the tuition, promotion and propagation of iaido within the kendo federations. These kata are officially known as the 'All Japan Kendo Federation Iai' ( 全日本剣道連盟居合, Zen Nippon Kendō Renmei Iai ), or Zen Ken Ren Iai (全剣連居合) and commonly referred to as seitei or seitei-gata. Three more kata were added in 1981 and two more in 2000, increasing the number of seitei iaido kata to the current twelve. These were drawn from elements of the major sword schools, including Musō Jikiden Eishin-ryū, Musō Shinden-ryū and Hoki-ryū. In 1969, the AJKF introduced its seitei curriculum of seven standardised iaido kata.
The committee subsequently selected the basic techniques from major iaido schools to form the curriculum of Zen Nippon Kendo Renmei Iaido. To popularise iaido and to make it easier for kendo practitioners to learn iaido, an expert committee was established by the AJKF to review the situation. The AJKF was founded in 1952, immediately following the restoration of Japanese independence and the subsequent lift of the ban on martial arts in Japan.
