Itsutsu-no-kata(五の形?, "forms of five") is a kata (a set of prearranged techniques) in Judo. It consists in five techniques, known only by their number. Although popular media generally claim that it was developed by Jigoro Kano, recent scientific research has conclusively shown that the kata predates the foundation of Kodokanjudo and that Jigoro Kano took it from Tenjin Shinyō-ryūjujutsu and merely imported it into judo after he made minor amendments to it. The kata is considered unfinished. However, a completed performance version of the kata, expanded to ten techniques, was recently presented under the name Tō-no-kata(十の形?, "forms of ten"). The techniques of Itsutsu-no-kata are composed of gentle movements evocative of natural forces.
^De Crée Carl, The Origin, essence, biomechanical foundations, and teaching and performance challenges of Itsutsu-no-kata [The Forms of Five] ―Kōdōkan jūdō’s esoteric sixth kata [Thesis]; Rome, Italy: University of Rome; 2012, pp. 1–423.