Medical model is the term coined by psychiatrist R. D. Laing in his The Politics of the Family and Other Essays (1971), for the "set of procedures in which all doctors are trained". It includes complaint, history, physical examination, ancillary tests if needed, diagnosis, treatment, and prognosis with and without treatment. The medical model embodies basic assumptions about medicine that drive research and theorizing about physical or psychological difficulties on a basis of causation and remediation.