This guide from the Coalition for Evidence-Based Policy summarises five well-conducted, low-cost randomised controlled trials (RCTs) carried out in real-world community settings. As the guide states, RCTs are regarded as the strongest method for evaluating programme effectiveness. Evaluations of the Triple P (Positive Parenting Programme) system and New York City’s teacher incentive programme are reviewed. The purpose of the guide is to illustrate the feasibility and value of low-cost RCTs for policy makers and researchers.
Source: Rigorous program evaluations on a budget: How low-cost randomized controlled trials are possible in many areas of social policy (2012), Coalition for Evidence-Based Policy