Air structures have developed through a number of significant stages: military applications, conventional standard air structures (the "bubbles"), exhibition structures, and permanent building applications. With no other type of structure is it possible to obtain clear, widespan coverage of almost unlimited areas, additional ceiling clearance for recreational activities at essentially no cost, translucency to permit uniform daylight, lighting through the entire roof system, and transportability or relocatability. Therefore, it is necessary to take into account the many features that are unique to the air-supported structure alone in evaluating competitive designs. If an optimum design for lowest cost is to be provided, and if the structures are to be successful, they must be of quality design; the design must fully coordinate methods of fabrication, handling, and shipment; and the installation procedures should be fully explored as part of the design with a fabricator experienced in working with large fabric structures. (Author/MLF)