Delivery rates for many preventive services are low in the U.S., often falling below 50%. Many factors contribute to this shortcoming, a number of which are within the control of the practicing clinician. This section discusses two important aspects of the delivery of clinical preventive services--establishing a preventive care protocol and implementing it in practice--and reviews basic principles of screening, immunization, and counseling. The references serve as a basic bibliography on the implementation of preventive services in primary care settings.