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 on historical data obtained from the patient. Unfortunately the patient is a poor witness to her bladder's activities and diagnoses arrived at...