The project should give an overview of some most fundamental issues encountered in fracture modelling of press-hardened steel. A method developed in this project is the Stepwise Modelling Method (SMM) and is used to characterize material properties like plasticity and fracture parameters. Using the microstructure composition data from forming simulations to perform crash simulations in multi scale analysis, the crack path can be analysed. The development of cohesive fracture models is the main goal the project. This should lead to an improvement of the development time and to lighter cars while maintaining the safety.