This book is designed to provide the new Computer Aided Design and Optimization tools and skills to generate real design synthesis of machine elements and systems on solid ground for better products and systems. This work provides the tool to directly obtain the synthesized real optimization tools to define the geometry and the particular selection of material. This is a new approach and a straightforward paradigm. It is divided into the following four parts:- Introduction and Design Considerations - Knowledge-based design: Introduction to the new Machine Element Design Synthesis - Introduction to computer aided design and optimization as tools used for Synthesis- Design of machine elements: Rigours traditional detailed design requirementsThese parts will include overview of chapters and enlightening design requirements.