This collection reprints key articles covering the organization, financing, and regulation of health care systems in three distinct contexts: * The development and growth of health care systems* Health care systems in transition and under reform* Future directions in the evolution of health care] systems A general introduction in the first volume provides a review of the collection as a whole, and individual volume introductions set the context for each volume.A general introduction in the first volume provides a review of the collection as a whole, and individual volume introductions set the context for each volume.