The 6th revised edition takes into account the changes of the new standard ISO 9001:2015. Checklists have been expanded and adjusted according to the requirements of the new standard. All terms have been aligned with the standard revision. The latest developments in the context of Industry 4.0 have been described. The quality management of companies is explained comprehensively and understandably, illustrated with numerous figures. The presentation is characterized by a strong practical relevance with the necessary theoretical foundation, resulting in easy implementability. Due to the coherence of the presentation and the inclusion of peripheral areas, the work also serves as a reference book for the reader. The book is aimed at engineers and technicians in all areas of industry (planning, development, manufacturing, sales), as well as commercial professionals.