The author summarizes the problems inherent in nomological approaches examining the efficacy of psychoanalysis as a form of treatment. He argues that nomologically oriented research operates with assumptions lacking empirical foundation and, moreover, that studies of this type merely give the impression of the effectiveness of psychoanalytic therapies while overlooking the specificity of the psychoanalytic method. He suggests that research into psychoanalytic treatments should not be subjected to a nomological conception of science, and that structural analysis of treatment courses should be examined and systematized within the frame of psychoanalytic treatment theory relative to their outcome. Given this approach, and provided that the theory of treatment is based on conceptual common ground, such studies would enable a prognostic conclusion that psychoanalytic treatments are successful, providing that the sequences generalized in the treatment theory do actually take place in treatments that take patients’ individuality into account.