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. Aikido practices Free Style where several attackers attack Nage at the same time. In this type of practice Uke's do not try to counter or resist Nage. They just take falls. Randori implies that Uke's make it difficult for Nage for training, not for victory.