Toyota's development-related factors of success. In the last years Toyotas success was a reason for many automotive makers to question critically their own production processes. However, Toyotas success is not only related in their ingenious production. Precondition in advance is a development understanding which focuses value adding to the customer. As outsourcing the production in best-cost countries lead to competitiveness, the situation among the development is more difficult. The processes are more complex, feasible solutions extensive and often only achievable in interdisciplinary teams. Aim of this publication is to raise awareness for these relations, but also to question the portability of Toyotas development understanding regarding the circumstances of manufacturing in Germany. © Carl Hanser Verlag, M̈nchen.