Transference and countertransference, the greatest Freud's discoveries, were defined on the basis of clinical Psychoanalysis of neurotic patients during the period when the psychoanalytic theory of the drivers was not more than libido theory. According to this background the definition of the transference was limited to the transmission of the conflict contents and emotions from the infantile periods of life and the primary object relations to later periods and subsequent relations in life. Countertransference, according to the first definition, remains limited to the clinical situation and the therapist's infantile respons to the patient's transferential contents. Both, the conept of the tranference and countertranference, were redefined during the development of the psychoanalytic theory, following clinical experience deriving from the psychotherapy of the patients with ego deficits. The transference should include all forms of the infantile relation to the therapist and the countertransference should comprehend any form of the infantile interaction of the therapist.