Urodynamic studies are one of the most useful clinical techniques available for the evaluation of lower urinary tract dysfunctions. Urodynamic data are of immense value in the diagnosis and treatment of many disorders of bladder and urethral function. However, there are problems of measurement that can limit the clinical applications of information obtained. First, the urologist should have a special interest in the neurophysiology of lower urinary tract disorders. Second, the standardized ICS concepts and terminology should be used in the descriptions of the findings. Third, the clinical value and limitations of each segment of the studies should be appreciated by the urologist. Fourth, careful attention should be given to the testing methodology and the calibration of the instruments. Finally, an investigative scientific approach should be taken to the interpretation of the data obtained.