Food preparation should be planned to allow a work flow whereby the food is processed through the flight kitchen from the point of delivery to the of assembly on the tray ready for distribution to the aircraft with the minimum of obstruction. The various processes should be separated as far as possible and food intended for human consumption should not cross paths with waste food or refuse. Staff time is costly and a design that reduces wasteful journey is both efficient and cost effective. Figure 7.1 illustrates a schematic example workflows in a typical flight kitchen.