The two brothers, Idries Shah and Omar Ali-Shah, worked and taught together for some time in the 1960s, but later agreed to go their separate ways. Their respective movements – Idries Shah's "Society for Sufi Studies" and Omar Ali-Shah's "Tradition" – were similar, giving some prominence to psychology in their teachings. Omar Ali-Shah's teachings had some distinctive features, however. He had many more followers in South America, and his movement attracted a younger following than his brother's. There were also more references to Islam in his teachings, and unlike his brother, Omar Ali-Shah's movement embraced some Islamicate practices.