Since occupants of an office building can be expected to be familiar with their environment, have less delay in starting their evacuation, and are generally more mobile and able bodied, they will likely take less time to reach protected exits. Therefore, an office building smoke control system might be limited to active systems to protect its stairways and passive means to protect floor-to-floor smoke spread. If, however, the same office building has high occupant loads per floor or the building includes assembly or dining at the top floor(s), or there is a simultaneous evacuation of numerous floors resulting in longer evacuation times due to queuing, the additional analysis may be necessary to determine whether additional active or passive smoke control measures are necessary.