Contained within Workshop on the Investigation and Reporting of Incidents and Accidents (IRIA 2002). Over the past 10 years (1992-2001), an annual average of over 4,200 incidents and accidents were reported to the Canadian Transportation Accident Investigation and Safety Board commonly known as TSB. In accordance with its Classification Policy, an average of 80 to 100 accidents with the greatest potential for advancing transportation safety are investigated each year. In support of this effort, TSB developed the Integrated Safety Investigation Methodology (ISIM) which includes the analysis of not only equipment functions, but also the interfaces between human and other system components controlled by managerial, design, regulatory and other procedures.