Evaluating Policy Impact: Working Out What Works

Randomised trials frequently produce surprising findings, overturning conventional wisdom. During the twentieth century, randomised trials became commonplace within medicine, saving millions of lives. Randomised trials within government can now be conducted more cheaply, using administrative data. Just as it might be considered unethical to conduct a randomised trial if a program is indisputably effective, it might be considered unethical not to conduct a rigorous evaluation if a program lacks evidence. Developed within a robust ethical framework, and alongside community consultation, better evaluation can help governments save money and address social disadvantage.