This chapter explains how health screening began, how the aims have evolved, how evidence and organisation influenced matters, and how challenges in the future will give rise to continuing change. It begins with Gould’s address in 1900 to the American Medical Association and charts events that led, almost by accident, to the institution of comprehensive annual testing of healthy adults in the USA, and to 5 day hospital-based ‘Human Dry Dock’ screening for Japanese executives. Scientific challenge then came from two randomised control trials, which failed to find benefit, but by then screening had become an important commercial activity. Using the UK cervical screening programme as a case study, the chapter explores how the optimism of the 1960s led through disillusionment, then to programme organisation and, by the 1990s, an era of realism. Evolution of the Wilson and Jungner criteria as an aid for policy making is covered. A key challenge now is to ensure best value policy, high quality systematic programme delivery and informed choice in the face of commercial forces that lead to the glossing over of screening’s complexities and far reaching consequences.
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