This series explores the evolution of primary care systems to better meet the needs of consumers with complex health conditions. It demonstrates that changes in the workforce are required to empower consumers to better manage their health. The series is a collaboration of the National Academy for State Health Policy and the AARP Public Policy Institute. We recognize that it takes a team of skilled professionals to deliver improved chronic care. In this series, we focus on how registered nurses -- who make up the largest segment of the health care workforce -- are being deployed in ambulatory delivery systems to take on new roles. Future series will focus on other members of the health care team. We selected six initiatives that offer replicable policy strategies to develop, implement, and sustain patient-centered approaches to care. Each case study highlights one of these initiatives and provides policy recommendations and an "on-the-ground" look at the work of its nurses.