The evolution of computer technology has made CAE ( Computer Aided Engineering ) an integral part of the total vehicle development process. Particularly for crash development, up-front input is crucial in determining vehicle architecture, performing trade off studies and setting design targets. Detailed FEA ( Finite Element Analysis ), although more accurate, is not always suitable at this stage due to (1) the lack of Detailed design information and (2) the large amount of modelling and analysis efforts. Concept/Hybrid models, however, can provide important input to make early design decisions without a detailed design.This paper uses a concept model to illustrate the above mentioned point. The model contains, the interior structure of a pick-up truck, driver occupant, restraints, and a detailed steering column assembly. Correlation with a physical test demonstrates the reliability of the model. Several restraint parameters which influence occupant performance are identified. Both DOE ( Design of Experiment ) and Optimization techniques are applied to obtain the optimum combination of parameters. The DOE process also include optimization. The results of both methods are compared and discussed.