ABSTRACT
The previous three chapters have presented a strong case for the gradual aggregation of high-quality evidence, where ‘evidence’ ideally comprises findings from randomised controlled trials (RCTs). This chapter is intended to make the case for other sources of evidence. The intention is not to argue for the merits of other approaches to garnering knowledge—that will be left to the remaining authors in this section. Rather, the intent of this chapter (at the risk of appearing overly negative) is to indicate the shortcomings of an over-reliance on RCTs as the sole source of credible evidence.
