The commentary presents both the substantive legal form requirements of the German Civil Code (sections 125-129 BGB) as well as the certification procedure of the Certification Act (sections 1-53 BeurkG). It offers a comprehensive overview of the form purposes and the scope of the individual form provisions, and of the requirements and effects of the individual forms -from certification to the written form and the electronic form to the text form. The notarial certification procedure is also presented in detail. This commentary is particularly appealing due to its presentation of the certification procedure and substantive law in one single commentary.