Injury causation data on twenty-five hundred traffic accident victims has been recorded on the Collision Performance and Injury Report, Long Form, Revision 3, and processed by the Highway Safety Research Institute into time shared computer files for analysis via remote terminals. The current injury causation recording system is described in order to demonstrate the potential for and the problems with analysis of this data. Currently two separate face lacerations and the corresponding contact areas that caused them--cannot be recorded. A proposed Occupant Injury Classification--is outlined following an approach similar to the Collision Deformation Classification (SAE J224a). Four dimensions or facets are described:​ Body Region, Aspect, Lesion and Body System/Organ. The OIC is terminated with an Abbreviated Injury Scale severity code. Injury causation information is readily available and widely needed. The proposed scheme is one effective way of making this information available for analysis.