Martin Hinsch summarizes all chapters of the ISO 9001:2015 shortly. The text offers both beginners and users with little knowledge of the standard an introduction to or a refresher course on the world's most important standard for management systems. Therefore, each individual chapter of the standard is described. The text is primarily aimed at those QM enthusiasts who would like to gain a basic understanding of the standard briefly, concisely and precisely about all the requirements relevant for day-to-day operations. About the Author: Prof. Dr. Martin Hinsch is an expert in aeronautical quality and process management. He is approved as an auditor for ISO 9001:2015 and for the aviation standard EN 9100. With his management consultancy he supports companies in setting up QM systems.