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This paper presents a simulation method and its application which enables the establishment and satisfaction of side impact design requirements. Three key phases are described: 1. Determination of desirable side intrusion velocity characteristics which minimize occupant injury in light of both ECER95 and FMVSS 214 regulations. 2. Development of a condensed vehicle model which enables the velocity characteristics determined in 1) to be translated into meaningful design parameters. 3. Practical application of the method showing how it can be used to: define side structure design requirements achieve desired velocity profiles enhance understanding of design cause and effect