Mass Customization today is seen as a core strategy for successful enterprises. The term denotes an offering that meets the demands of each individual customer. but that can still be produced with mass production efficiency. Current developments such as 3D-printing, smart data or digital production are strengthening this trend. Strategies and examples of mass customization have been widely published in recent years. This publication comprises interviews with 24 selected MC-experts, practitioners and researchers, giving a comprehensive report on success factors.