Security is a relatively new topic in the automotive industry. In the former days, the only security defense methods were the engine immobilizer and the anti-theft alarm system. The rising connection of vehicles to external networks made it necessary to extend the security effort by introducing security development processes. These processes include, among others, risk analysis and treatment steps. In parallel, the development of ISO/SAE 21434 and UNECE No. R155 started. The long development cycles in the automotive industry made it necessary to align the development processes' early designs with the standards' draft releases. This work aims to design a new consistent, complete, and efficient security development process aligned with the normative references. The resulting development process design aligns with the overall development methodology of the underlying, evaluated development process. Use cases serve as a basis for evaluating improvements and the method designs. This work concentrates on the left leg of the V-Model. Nevertheless, future work targets extensions for a holistic development approach for safety and security.weiterlesen