Book excerpt: This book provides a comprehensive discussion of Adaptable Design (AD). It covers the conception, method, and application of AD to the real-world product design. AD's benefits are substantial as it upgrades, reuses, remanufactures and recycles products throughout the product lifecycle. It rapidly adapts the existing design in development of new designs. Key elements of AD include rationalized function structures, adaptable product architectures, adaptable interfaces, and adaptability evaluations. The main feature of AD is adaptability in design methods and product applications with general and specific adaptability. AD has also modeling and evaluating adaptabilities.