A T-group or training group (sometimes also referred to as sensitivity-training group, human relations training group or encounter group) is a form of group training where participants themselves (typically, between eight and 15 people) learn about themselves (and about small group processes in general) through their interaction with each other. They use feedback, problem solving, and role play to gain insights into themselves, others, and groups.
The concept of encounter as "a meeting of two, eye to eye, face to face," was articulated by J.L. Moreno in Vienna in 1914–15, in his "Einladung zu Einer Begegnung" ("Invitation to an Encounter"), maturing into his psychodrama therapy. It was pioneered in the mid-1940s by Moreno's protege Kurt Lewin and his colleagues as a method of learning about human behavior in what became the National Training Laboratories (also known as the NTL Institute) that was created by the Office of Naval Research and the National Education Association in Bethel, Maine, in 1947. First conceived as a research technique with a goal to change the standards, attitudes and behavior of individuals, the T-group evolved into educational and treatment schemes for non-psychiatric patient people.
A T-group meeting does not have an explicit agenda, structure, or express goal. Under the guidance of a facilitator, the participants are encouraged to share emotional reactions (such as, for example, anger, fear, warmth, or envy) that arise in response to their fellow participants' actions and statements. The emphasis is on sharing emotions, as opposed to judgments or conclusions. In this way, T-group participants can learn how their words and actions trigger emotional responses in the people they communicate with. Many varieties of T-groups have existed, from the initial T-groups that focused on small group dynamics, to those that aim more explicitly to develop self-understanding and interpersonal communication. Industry also widely used T-groups, particularly in the 1960s and 1970s, and in many ways these were predecessors of current team building and corporate culture initiatives.