In his James Madison Lecture, Judge Robert A. Katzmann argues that federal courts have much to learn from Congress and agencies about how statutes should be interpreted. In the voluminous discussion of how courts should construe statutes, there has generally been little consideration given to an appreciation of how Congress actually functions; how Congress signals its meaning; and what Congress expects of those interpreting its laws. In examining that lawmaking process, Judge Katzmann looks to how legislators signal their legislative meaning to the first inter- preters of statutes—agencies—and to how agencies regard Congress’s work product in interpreting and executing the law. He contends that Congress intends that its work be understood through its institutional processes and reliable legisla- tive history. In our constitutional system in which Congress is charged with enacting laws, the methods by which Congress makes its purposes known—through text and reliable accompanying materials—should be respected, lest the integrity of legislation be undermined. Agencies well appreciate and are responsive to Congress’s perspective that such materials are essential to construing statutes. By understanding statutory interpretation as an enterprise involving other institutions, we can better address the question of how courts ought to interpret statutes. Against that background, Judge Katzmann examines two approaches to the judicial inter- pretation of statutes—purposivism and textualism—and concludes with a discus- sion of practical ways in which Congress may better signal its meaning and how courts may better inform Congress of the problems courts identify in the statutes they review.