According to psychoanalysis there is a relationship between gaining insight and therapeutic success. To clarify this relationship it is necessary to differentiate regions of psychoanalytic theory. On the one hand there are foundational theories - personality and aetiological theory - on the other hand there are technological theories: they explain the therapeutic process and generate rules for therapeutic intervention. The latter are supported by the former, but cannot be logically derived from them. The link between the mediation of self-knowledge and (...) the improvement of the state of the patient is a theoretical and practical issue of psychoanalysis: theoretically it is a hypothesis that has to be proved by empirical investigation. Practically it is an aim to be fulfilled. A therapeutic theory should list the conditions that are necessary for this. (shrink)