Frequency-of-Use Principle Another principle for layout considers how often components are used in operating a system. A display or control that is used very frequently should be given a location that is very convenient for the operator.
Functional Principle This principle suggests that things that are functionally related should be grouped together. The grouping may be based on conceptual factors, such as flow of fluid through a piping system. Grouping by similarity, for example, keeping all electrical system controls together or all hydraulic system controls together, exhibits another type of functional relationship.
Sequence-of-Use Principle Another principle for layout considers the order in which one reads displays or operates controls. Those things that are operated in sequence should be located together and in sequential order.