The first monograph on Wolfgang Klafki: the great didactician of German educational science. The authors engage critically and constructively with Klafki and his work. At the same time, they examine the path that educational theory and critical-constructive didactics can take today. Thus, the book goes beyond Klafki's works to demonstrate that and how Wolfgang Klafki laid the foundation for a didactics for the 21st century. His work is of current relevance and remains a lasting provocation for general didactics, educational theory, and subject didactics.