The San Francisco Psychotherapy Research Group (formerly called the Mount Zion Psychotherapy Research Group) was founded in the early 1970s by Joseph Weiss, M.D., and Harold Sampson, Ph.D., both analysts at the San Francisco Psychoanalytic Institute. A large number of professionals have been associated with the group, which is one of the few in the United States engaged in programmatic research of the therapeutic process and development of a full-scale psychoanalytic theory. The theory is informally known as Control-Mastery Theory, from two of its assumptions: (1) people exercise considerable unconscious control of their mental lives (an assumption that contrasts with the view that the unconscious serves only as a repository of drives, blindly seeking expression), and (2) patients enter treatment seeking to master their difficulties, although they may be unaware of significant parts of their treatment goals (an assumption...