Human error is implicated in nearly all aviation accidents, yet most investigations and prevention programs are not designed around any theoretical framework of human error. This popular workshop expands upon the materials presented at the 1997 Symposium and provides additional tools and information needed to conduct human error analysis of aviation accidents and incidents. The workshop contains a complete description and demonstration of the Human Factors Analysis and Classification System (HFACS), which incorporates Reason's (1990, Human Error), model of latent and active failures as a foundation. Widely disseminated among military and civilian organizations, HFACS encompasses all aspects of human error, including the conditions of operators and organizational failure.