Empirical research has been used to study many areas of law, including administrative law. In this article Professor Coglianese discusses the current and future role of empirical research in understanding and improving administrative rulemaking. Criticism of government regulation and calls for regulatory reform have grown in the last few decades. Empirical research is a valuable tool for designing reforms that will truly improve the effectiveness, efficiency, and legitimacy of regulatory governance. Specifically, Professor Coglianese discusses three areas of administrative law that have benefited from empirical research—economic review of new regulations, judicial review of agency rulemaking, and negotiated rulemaking. Agencies are now requ...