On July 17, 2013, the 7th HOAI amendment came into effect. This completely revised edition presents a comprehensive and practical legal commentary on all service areas covered by the HOAI 2013 for architects and engineering services. The editors, in collaboration with specialized engineers, comment on the entire fee schedule and provide an important working tool for architects, engineers, as well as lawyers and judges dealing with issues of architect fee law. This tool offers clarity in the interpretation and application of the regulations and also takes into account the latest case law related to the HOAI. Please note: An erratum has been created for the list of contributors and the assignment of contributors to the paragraphs. It is available for download on this page.