By applying the principles of classical mechanics to approximations of aerodynamic and ground interaction forces, a general tree dimensional debris fragment transport code, DEBRIS, has been written. Certain field experiments have been simulated and experimental outcomes have been compared. Although simulation of long distance or high speed transport by tumbling or sliding over ground surfaces is not satisfactory, short distance transport, such as might be found following structural collapse, is sufficientily realistic to enable DEBRIS and a previously developed building response code, BRACOB, to be ultimately capable of describing outside wall debris patterns. It is recommended that velocity dependent loss mechanisms be incorporated in DEBRIS to improve its simulation of long distance transport and that certain existing uncertainties concerning wall debris creation and transport be lessened by means of a full size or near full size field experiment.