Evidence-based medicine (EBM) is underpinned by the study of the ways in which we can gain knowledge regarding key clinical questions such as the effects of medical interventions, the accuracy of diagnostic tests, and the predictive value of prognostic markers. EBM provides an account of how medical knowledge can be applied to clinical care. EBM not only provides clinicians with a strategy for best practice, but also, underlying that, a philosophy of evidence.