Aikido is based on the martial art of Daitō-ryū Aiki-jūjutsu, but began to separate from it in the late 1920s, partly due to Ueshiba's involvement with the Ōmoto-kyō religion. Ueshiba's early students' records use the name "aiki-jūjutsu". Many of Ueshiba's senior students have different approaches to aikido, depending on when they studied with him. Today aikido is found all over the world in a number of styles, with different groups placing importance on different things. However, they all share techniques learned from Ueshiba and most have concern for the safety of the attacker.