Primary care practices are turning toward team-based strategies such as panel management, in which nonclinicians address routine preventive and chronic disease care tasks for a group of patients. No known validated instruments have been published for measuring panel management implementation. The authors developed the 12-item Panel Management Questionnaire (PMQ) measuring 4 domains. Data were assembled from self-administered cross-sectional surveys of 136 staff and 204 clinicians in 9 county and 5 university adult primary care clinics. Staff and clinician PMQ scores in each clinic were correlated. The clinic-level median PMQ score was positively associated with a composite clinic quality measure.