The paper provides a first survey of the literature on external validity. The starting point for this are debates regarding the use of randomised evaluations to inform policy. Besides synthesising contributions to the programme evaluation literature we consider definitions of external validity...

Purpose – The purpose of this paper is to provide a selective, UK‐focused review of recent literature on effective interventions for preventing and reducing conduct problems in 3‐8 year olds; and to update the chapter in the Sutton et al. (2004) research report Support from the Start on...