The Administrative Procedure Act regulates the official administrative procedure, from procedural principles to the issuance of administrative acts and the legal remedy process. Knowledge of the details regarding all procedural issues, particularly the frequent changes in legislation and the latest case law, is crucial for practitioners dealing with authorities and courts, and is decisive for the safe application of administrative procedural law. The new commentary on the Administrative Procedure Act meets these requirements in a comprehensive and clear manner. Additionally, the included commentaries on the Administrative Enforcement and Administrative Service of Process Act provide extensive coverage of general procedural law. The author, Professor Dr. Dieter Kugele, a judge with experience in court practice, places particular emphasis on this.