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At an early stage of the development process a certain number of chassis parameters are only defined at a minor grade of accuracy. According to the maturity of the development process, an evolution of chassis parameters occurs because of design decisions. In order to set up an efficient chassis development process, a comprehensive system understanding is necessary to avoid unnecessary design iteration loops. Therefore driving dynamics knowledge based on road tests should be expended with a systematic analysis of cause-effect correlations through simulation. A numerical method for the impact analysis of basic vehicle and chassis parameters on driving performance is shown. Therefore the calculation of a sensitivity index is introduced. By determination of the sensitivity indices regarding different complex levels of categories in a portfolio analysis, quantified statements of cause-effect correlations between chassis parameters and driving performance can be made. The results enable a knowledge which parameters can be focused on in an early stage of the development process. The presented method is exemplified on impact analysis of chassis parameters on the crosswind behaviour of passenger cars. Therefore the causeeffect correlations regarding two different kinds of aerodynamic excitations were investigated. Chassis parameter influence on vehicle response to a wind generator test and to a generic aerodynamic gust was analysed. Through comparison in a portfolio analysis the negotiability of cause-effect correlations concerning a wind generator test to vehicle behaviour to aerodynamic gusts is shown.