Kurt Lewin laid the foundations for sensitivity training in a series of workshops he organised in 1946, using his
field theory as the conceptual background. His work then contributed to the founding of the
National Training Laboratories in
Bethel, Maine in 1947 – now part of the
National Education Association – and to their development of training groups or
T-groups. Meanwhile, others had been influenced by the wartime need to help soldiers deal with traumatic stress disorders (then known as
shell shock) to develop group therapy as a treatment technique.
Carl Rogers in the fifties worked with what he called "small face-to-face groups – groups exhibiting industrial tensions, religious tensions, racial tensions, and therapy groups in which many personal tensions were present". Along with others drawing on the ideas of the
Human Potential Movement, he extended the group idea to broad population of 'normals' seeking personal growth, which he called encounter groups, after the existential tradition of an authentic
encounter between people. Other leaders in the development of encounter groups, including
Will Schutz, worked at the
Esalen Institute in
Big Sur,
California. Schutz himself stressed how "the terms 'T-group' (T for training) and 'sensitivity training group' are commonly used...synonymously with 'encounter group'". ==Focus and legacy==