The basic factor in determining the systems is the needs. As a result of the interviews with the industrialist, the needs are determined and the most suitable systems are selected. Thus, the employer starts to use the prefabricated structure he has built in a way that suits his requests and meets his needs. The mezzanine, panel wall, single slope roof, canopy and crane systems can be used separately or all together. Many prefabricated structures we make today are included in the group of mixed systems.