Dramatic changes to the structure of health systems since the 1980s has seen the development of large, integrated health organizations designed to provide scale and scope advantages, improve the quality of care and health outcomes, and provide greater bargaining power relative to payers and large employers. This transition has led to greater interest in understanding hospitals and health systems as complex systems. Two important themes emerged from this effort: 1. Creation and organization of physician-health organizations, and alignment of these organizations with hospital or system...