 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".