This study focuses on the idea of an evidence‐based approach to medical problems, which has been in existence for more than 30 years. This idea of carrying systematic knowledge into practice in public health has recently become part of the present government's drive to modernisation and improved delivery. The study outlines the work of the Health Development Agency (HDA), which has the task of both assembling the public health evidence and obtaining evidence of effectiveness of public health interventions into practice. The underlying purpose is to get evidence together which would help to reduce inequalities in health. A number of lessons in this activity are described.
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