Urodynamic evaluation of the incontinent female has come of age. It is no longer accept- able to subject women to surgical procedures for urinary incontinence based solely on the physician's clinical impression of the cause of the urine loss. Multiple studies in the uro- gynecological literature have told us that the error rate for stress incontinence is about 25% and the error rate for the unstable bladder is 50% when these diagnoses are based solely...