Modern technology has effected major improvements in health care delivery, yet basic concepts for noninvasive blood pressure measurement have not changed significantly in 60 years. Sphygmomanometry has been improved by electronic pulse detectors, ultrasonic wall-motion sensors, automatic cycling, digital displays, etc.; however, little progress has been made to permit continuous, noninvasive ambulatory monitoring. Increased awareness of hypertension by the medical community and the general public has augmented the demand for reliable, easily administered methods. The three papers in this section demonstrate novel approaches toward improved blood pressure measurement.