This latest edition describes why MBD is important to your organization. The discussions around tools, processes, standards, and most importantly, the people who use MBD are updated to match current industry practice. MBD is the foundation for Model-Based Systems Engineering (MBSE), Industry 4.0, and creating digital twins. ◦ The first edition of the book considered how CAD jockeys designed products and did not include the broader benefits during manufacturing. Jennifer Herron, founder & CEO of Action Engineering, states: "The downstream benefits of MBD on the shop floor and during inspection often eclipse the time and effort savings in engineering, so it is imperative to engage the entire enterprise." Because the engineering department is often the only MBD champion, MBD implementations fall short because critical workflows are missed in internal and external supply chain operations. Understanding the why, what, and how across the entire enterprise is the key to MBD adoption. ◦ What's new? - Terms and definitions are updated and clarified - All graphics are updated - 3D examples are revised - The Four Parts of MBD are presented - Suppliers are discussed - Standards are updated