An extremely important aspect of implementing and maintaining a reliable clinical PACS is the formation of structured quality control and user education programs. Often when systems are deployed for clinical use, improvements and usage come about slowly. This is often due to a lack of sufficient clinical feedback and/or lack of enthusiasm by the developers to make recommended changes. The PACS quality control program at UCLA is comprised of six coordinators who keep in close contact with the clinical operation. Their responsibilities include: (1) checking the status of all system processes, (2) educating PACS users on protocols and program interaction, (3) conducting user surveys, (4) checking image quality, (5) checking workstation study availability, and (6) periodically generating error and performance reports. The quality control program has been invaluable in improving system functionality and reliability. Protocols have been developed which result in daily reports summarizing the acquisition, archive, and workstation forwarding status of all studies from 4 CT, 3 MR, and 2 CR systems. The reliability of the acquisition and archiving subsystems of our PACS is over 98 percent. The clinical coordinators also study the clinical behavioral effects of PACS on its users.