This book provides an accessible, yet sophisticated treatment of the essential principles of administrative law. Topics covered include a history of the American administrative state; theories of agency behavior; separation of powers and procedural due process, as they are implicated by the administrative process; the procedural framework of the Administrative Procedure Act; formal adjudicatory procedure; informal rulemaking procedure; and the availability, timing, and scope of judicial review. The book includes charts and diagrams that assist the reader in visualizing the major elements of the administrative process.