The incident command system (ICS) is a particular approach to assembly and control of the highly reliable temporary organizations employed by many public safety professionals to manage diverse resources at emergency scenes. Our inductive study of a fire department's use of the ICS identified three main factors enabling this distinctively bureaucratic system to produce remarkably flexible and reliable organizations for complex, volatile task environments. This research suggests the possibility of new organizational forms able to capitalize on the control and efficiency benefits of bureaucracy while avoiding or overcoming its tendencies toward inertia.