Samenvatting
Witness reports are usually the single most significant source of information about the events leading up to an accident. For a variety of reasons these reports tend not to converge perfectly. But witnesses are viewed as knowledge experts and the task of an investigation of an accident is seen as eliciting that knowledge or expertise and describing it in the form of relational network. The development of more sophisticated recording apparatus capable of transforming in- formation to large relational databases should be encouraged.