This article focuses on the economic regulation of infrastructure industries such as electricity, telecommunications, and water and, in particular, on the evaluation of outcomes, rather than regulatory procedural processes. Furthermore, it discusses the evaluation methods in detail. It also discusses alternative methods that have been used in recent years to evaluate regulatory agencies including the various types of case study, econometric, and other methods of statistical analysis. It then considers the proposed structured case study approach in the World Bank Handbook on the evaluation of infrastructure regulatory systems that tries to combine the evaluation of regulatory governance with the evaluation of industry outcomes. This article also covers the application of that and similar methods both in the context of infrastructure regulation and of merger remedies in competition policy.