This commentary provides a practical treatment of the normative text of EC 4, Design and Construction of Composite Structures of Steel and Concrete, Part 1-1: General Design Rules and Application Rules for Building Construction, along with its national annex, and consolidates it into a coherent text (consolidated version). The specific German rules and additions are explained in relation to the European text. The explanations and comments assist the reader in quickly familiarizing themselves with the EC4 regulations and applying them confidently in practice. The work is complemented by a series of examples. The structure is as follows: Foreword, Introduction, Normative Text with integrated NA, Commentary on the chapters of the standard, Examples.