Thirty patients suffering from stress incontinence of urine following hysterectomy or operation for genital prolapse underwent operation after study of the colpocystogram. This examination, practically painless and free of risk, visualises pelvic visceral kinetics and is felt by the author to be essential. It confirms the existence of stress incontinence, reveals the usual cause, detects associated abnormalities and indicates the appropriate surgical technique. The method of treatment was paramedial or medial fixation of the uterus, vagina or residual cervix to the public promontory, complemented in some cases by excision of the pouch of Douglas or posterior myorraphy. Apart from in certain special cases (irritable tirgone syndrome) the cure of mictional problems can be guaranteed.