Experiments are also rarely able to reliably measure and isolate the effects of very complex justice interventions. Policymakers and practitioners in the justice sector should consider evaluation research as a portfolio of strategic investments in knowledge development. Randomized controlled trials are merely one asset in a broader investment strategy.
In setting priorities for funding and support, intervention programs demonstrated to be effective and efficient are preferred over programs that are well intentioned but untested by rigorous evaluation. An evidence-based approach is undeniably better than an approach based on faith or anecdotes, but the findings of existing evaluations are not sufficient by themselves as a basis for effective policy-making. Translating research into practice requires more than a review of existing studies. It requires knowledge of the research process and its limitations.