In jujitsu training was almost exclusively through kata. Where Randori was used extensive training in kata preceded training in Randori. Randori developed out of nokori ai. Nokori ai developed from kata shortly before the Meiji Restoration of 1868 (Kodokan Judo.) Neither most systems of Aikido nor Kuta train with Randori. One might say that they are more traditional. Randori is a useful training tool because it teaches the ability to cope with the uncertainty of real confrontations. It also teaches what works and what doesn't work.