Timely accident investigations are critical to the future of safe transportation operations, for a number of reasons. First, they must begin expeditiously. As the clock runs, evidence can deteriorate or become corrupted. Witness memories of events fade, sometimes to the detriment of actual fact-finding. Second, the search for cause factors and efforts to remediate are delayed, leaving people and property at risk of more accidents and incidents caused by the same risk factors. Third, as time passes, other accidents and incidents demand investigation, putting a strain on investigatory resources.