Dr. Sills has been a health services delivery research investigator at ACCORDS since 2002. Her research has focused on using electronic health data methods to define and model systems- and patient-level factors associated with process and outcome measures of health care quality, with a focus on asthma in acute and primary care settings for children. This work has assessed variation in quality of care for various conditions, and has demonstrated the importance of rigorous methods in selecting and implementing quality metrics. These publications have highlighted the importance of the following in quality measurement: (1) selecting process measures only when they have demonstrated association with outcomes of value; (2) using risk-adjustment that extends beyond adjustment for the severity of the acute condition to encompass chronic medical complexity and social determinants of health; and (3) incorporating adjustment for structural measures of quality, including crowding and occupancy measures.