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Side impact crashworthiness presents a complex problem due to the dynamic interaction between the occupant and the intruding vehicle side structure. As there is a direct impact between the occupant, and the door and B-post trim, small variations in the vehicle structural behaviour can have a significant effect on the dummy response and injury levels. Significant variability in dummy response between crash tests causes problems when evaluating the vehicle side structure and development of side impact restraint systems. A programme of research tests has been conducted at the Motor Industry Research Association (MIRA) using the MIRA - Side Impact System (M-SIS) technique to evaluate the dynamic response of side impact dummies in actual side impact environments. With the implementation of the European side impact legislation in 1998 the effects of variations in dummy location and velocity profile need to be understood.