Book excerpt: "The World Health Organization's history spans more than six decades. The past twenty years has been a particularly busy period in the organization's development, given the transition from international to global health cooperation and thus the need to adapt to major changes in its operating environment. Consequently, the WHO has been a direct part of new institutional arrangements and has shared in increased funding to provide for global health. It has also had to adapt its activities and programs in response to rival initiatives, leading to many changes--not only to the names of specific parts of the WHO but also to the nature of their activities. This second edition explores the organization's institutional complexity."--Back cover.