ABSTRACT
Previous contributions (Chapters 1 and 2) have addressed the question ‘what is evidence?’ in the broadest sense. Originally my presentation at the meeting which forms the basis of this book was concerned solely with the problem of assessing treatment efficacy and the role of the randomised controlled trial, but before doing so it is instructive to continue the theme of evidence in a wider sense, and indeed to refer specifically, as do the previous contributions, to matters arising when one is asked to give evidence in a legal context.
