"…….Margaret Chan, Director General of the World Health Organization WHO, has stated that "Universal Health Coverage is the single most powerful concept that public health has to offer."

In this themed issue of The Lancet, the first of three Series papers explores the evidence on the links between expansions in coverage and population health outcomes. The second paper looks at the political and economic dimensions of the transition to universal health coverage, and the third examines nine low-income and lower-middle-income countries in Africa and Asia that have implemented national health insurance reforms. Also, a Viewpoint calls for continued progress and argues for a large public sector role in health systems reform.

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