Control mastery theory or CMT is an integrative theory of how psychotherapy works, that draws on psychodynamic, relational and cognitive principles. Originally the theory was developed within a psychoanalytical framework, by psychoanalyst and researcher Joseph Weiss, MD (1924-2004). CMT is also a theory of how the mind operates, with an emphasis of the unconscious, and how psychological problems may develop based on traumatic experiences early in life. The name of the theory comes from two central premises; the assumption that people have control over their mental content, and the belief that patients who come to therapy are fundamentally motivated to master their lives.