On May 4, 1988 a fire occurred after hours on the 12th floor of the First Interstate Bank building, a 62 story steelframe office tower in Los Angeles California. The sprinkler system in the building was not operational. The fire spread though the 12th floor and extended to the 13th , 14th , 15th and part of the 16th floor before it was under control by the fire department. Discrete event simulation is applied here to evaluate the time for firefighters to access to the 12th floor, the fire origin. GPSS/H is used to analyze lognormal distributions developed to represent the firefighter task data. These results are compared to those using triangular distributions, as well as data collected concerning the fire department response to the World Trade