Daniel Siegl from LieberLieber Software, together with Hermann Gollwitzer from Volkswagen consider and show how MBSE is introduced at Volkswagen to develop software on the basis of reference-architecture. Fundamental interrelationships for cooperation in the multi-layered development environment for the benefit of all participants and for the development of sustainable, constantly expandable solutions are presented. Additionally argued is how Automotive SPICE requirements are perforable in a related setup as an example and how configuration management can be realized for models.