The document describes four stages of evolution for the design of health care organizations. Stage 1 is characterized by a fragmented system with autonomous physicians and organizations. Stage 2 sees the formation of referral networks and multidisciplinary teams. Stage 3 incorporates more patient-centered care, greater use of teams, and modest use of information technology. Stage 4, described as the vision for the 21st century, aims to fully redesign care processes around patient needs with state-of-the-art use of information and a coordinated, integrated delivery system. The document recommends workshops to help organizations progress toward this Stage 4 model.