This book is about a practical approach to the Mass Customization of complex products and services, namely "Configure-to-Order", the definition of modular product packages and their configuration on demand, to fit customer-specific needs. "Configure-to-Order" concepts apply equally well to configuring complex products, services and software and are relevant in industries ranging across manufacturing, public services and financial services. The objective is to provide the reader with a manageable approach to modularization and Mass Customization, the benefits of this approach and the shift necessary to get there.