According to Sir Michael Rawlins, ‘evidence, in the present context, has only one purpose. It forms the basis for informing decision-makers about the appropriate use of therapeutic interventions in routine clinical practice. Such decisions have to be made at various levels but, invariably, with critical consequences for patients, families and society’ (Rawlins, 2008).Today, the topic of evidence seems more emotive than ever before. Why might this be? And what reaction is appropriate?