This book revisits the theory of social systems as a defense against anxiety first set out by Elliott Jaques and Isabel Menzies Lyth in papers which they published in 1955 and 1960, and which have been influential points of reference ever since. Menzies Lyth's study of the nursing system of a general hospital, with its roots in both psychoanalysis and socio-technical systems thinking, has remained one of the most convincing demonstrations of the influence of unconscious anxieties on social behavior, and of their effects in inducing dysfunctional defensive systems in organizations. The theory...