The design of a high-rise building will influence the final construction cost. If the architect, structural and mechanical engineers can work together and if they know the type of equipment that is available, they can greatly reduce the cost of a job. There are many different types of forming systems, forming materials, shoring and scaffolding available. Some of these serve the same type of design, while others are for a specific use. The contractor should select one basic system for each aspect of his job and then stick with it throughout the entire job. After selecting a system, layouts of the different floors should be prepared and the proper equipment secured to establish a workable cycle. Usually the form manufacturer will assist in these matters if the contractor passes along to him the pertinent specifications. As the erection of equipment start, the reinforcing follows up to complete a section for concreting. On a routine cycle, the first placement might be made the second day, while erection continues on for the next section. The third day would probably find the first section having the forms removed and moved ahead for another section or up to the next floor, while the second section is being placed and the third section erected. This is dependent upon the number of sections and the foregoing limitations. It is quite possible on a long structure, to see all operations going at once on one floor. As the cycle is repeated floor by floor, other trades can move in and follow the concrete work. It is important, therefore, to see that all trades are kept busy and that there should not be delays or work stoppages between operations. Some designs require spandrel beams, and these may be deep enough to resemble a small wall running around the slab or perimeter of the building. Other types of construction include beam and slab construction, waffle or ribbed slabs, and concrete slabs with a structural steel frame.