at least six months after their experience. The most dangerous groups had authoritarian and charismatic leaders who used vicious emotional attacks and public humiliation to try to break participants. However, a peer-reviewed review of studies published in 1975 concluded that "No study yet published provides a basis for concluding that adverse effects arising from sensitivity training are any more frequent than adverse effects arising in equivalent populations not in groups". See also Appreciative inquiry Focusing (psychotherapy) Four-sides model Improvisation Insight dialogue Learning circle Nonviolent communication Notes References Aronson, Elliot, 1984. The Social Animal, Fourth Edition. New York: W.H.Freeman and Company. Further reading Carl Rogers, Encounter Groups, 1970 Crosby, G. "Planned Change: Why Kurt Lewin's Social Science is Still Best Practice for Business Results, Change Management, and Human Progress." (2021) (Routledge) Chapter 10 is "The Birth of the T-group." William Schutz, Elements of Encounter, 1973 Gerald Corey, Theory and Practice of Group Counseling, second edition, 1985 External links About T-Groups Group psychotherapy United States Navy