To encourage widespread adoption of quality measurement and improvement activities designed to meet the needs of patients, health care leaders must learn more about the relationship between patient-centered care and improved clinical outcomes. This project will analyze the association between patient care experiences and clinical performance at both the individual physician and practice levels. As part of their work, the investigators will determine whether specific components of the patient experience, such as communication or trust, are more strongly associated with clinical quality, and whether the relationship between patient satisfaction and clinical performance sometimes depends on the level of patient adherence required for treatment. Results from these analyses could generate a greater commitment among health systems, purchasers, and policymakers to patient-centered care.