The 'regressive process' in the analytic situation has a dynamic character of its own produced by the regressive object relation with the analyst (transference and countertransference), so long as it is correctly interpreted with sufficient frequency and with good timing. The regressive process is inevitable and useful, and its intensity and amplitude are determined by the pathology of the patient, the tolerance of the analyst, and his technical modality. The study of countertransference reactions, especially the countertransference neurosis, helps the analyst avoid using the patient as an object of his own regression. This limits the mutual tendency toward acting out, and emphasizes interpretation as the only valid and effective element in the attempt to help the patient acquire a greater degree of mental health.