Peters, Jörg; Langbein, Jörg; Roberts, Gareth - 2017
When properly implemented, Randomized Controlled Trials (RCT) achieve a high degree of internal validity. Yet, if an … RCT is to inform policy, it is critical to establish external validity. This paper systematically reviews all RCTs … with external validity. Following Duflo, Glennerster, and Kremer (2008), the hazards to external validity we scrutinize are …