</ref> a millenarian movement, a world affirming movement, a new social movement, a guru-centered movement, a personal growth movement, a religion, and a cult. Additional sources contend that TM and its movement are not a cult. Participants in TM programs are not required to adopt a belief system; it is practiced by atheists, agnostics and people from a variety of religious affiliations. The organization has also been criticized as well as praised for its public presentation and marketing techniques throughout its 50-year history.