 Northfield Hospital was a military hospital, situated in Birmingham, in the English Midlands, with the task of treating soldiers who had developed psychiatric problems, in order to get them back into the war.Together with John Rickman, Wilfred Bion introduced group meetings as the principal method of change for these patients.This Experiment, together with the Second Northfield Experiment associated with the innovations of S. H. Foulkes, Tom Main and Harold Bridger, contributed the following elements to the emerging discipline of socio-analysis