Therapeutic community is a participative, group-based approach to long-term mental illness, personality disorders and drug addiction. The approach was usually residential, with the clients and therapists living together, but increasingly residential units have been superseded by day units. It is based on milieu therapy principles, and includes group psychotherapy as well as practical activities. Therapeutic communities have gained some reputation for success in rehabilitation and patient satisfaction in Britain and abroad. In Britain, 'democratic analytic' therapeutic communities have tended to specialise in the treatment of moderate to severe personality disorders and complex emotional and interpersonal problems. The evolution of therapeutic communities in the United States has followed a different path with hierarchically arranged communities (or concept houses) specialising in the treatment of drug and alcohol dependence. History Antecedents There are several antecedents to the therapeutic community movement. One of the earliest is the change in treatment of institutionalised patients in the late 18th century, continuing throughout the 19th century. A major contributor to this change is Philippe Pinel, a French physician who advocated for a more humane treatment of psychiatric patients. In Britain William Tuke founded the Retreat where patients were treated according to humanitarian principles, called moral treatment. Tuke based the treatment of mentally ill people partly on the Quaker ideology. The influence of Quaker principles continues through out the development of the therapeutic community. Moral treatment focused on a more humane treatment of patients and a stimulating environment that engages them in healthy behaviour. An important distinction between the later therapeutic community is the strong hierarchy in moral treatment facilities. The superintendent had authority over and responsibility of the patients. The patients followed a strict schedule to promote obedience and self-control. After the First World War, multiple varieties of living-and-learning communities for young adults were established. Examples are the Little Commonwealth school run by Homer Lane and the Q camps initiated by Marjorie Franklin. The Q camps were based on Planned Environmental Therapy, which focused on normally functioning parts of a patient's personality and use them to deal with difficult social situations. These projects all emphasized shared responsibility and decision-making and participation in the community. What influenced the establishment of these projects were, among others, the developments in psychoanalytic theory in Great-Britain. United Kingdom The work conducted by pioneering NZ plastic surgeon Arcihibald McIndoe at Queen Victoria Hospital and others at Northfield Military Hospital during World War II