The chances of you seeing your VW Golf exactly like this a second time on the road are slim. The explosion of variant diversity, driven by consumers who insist on their individuality, is in full swing. This third revolution after Henry Ford and Toyota does not exclusively affect manufacturers, but the entire value chain. The authors show that the solution to the conflict of efficiency and diversity is already to be found in the development of new vehicles. One answer to this challenge is modular concepts that open up completely new business models. Required reading - not only for automotive managers.