1.1-5 Correspondence Mapping

There should be an explicit mapping between the characteristics and functions of the system to be represented and the features of the display representation, i.e., changes in the appearance of the display form should have a one-to-one relation with the plant states it represents. These changes should result from explicit rules relating the physical form of the display and its meaning to the plant state represented.

Additional Information:
Correspondence mapping addresses how well the display communicates meaningful information about the plant to operators. The physical form and functions of the display should be explicitly tied to the plant's functions and states. The display form and function must consider the instrumentation and the data processing that drive the display format. If a single display can lead to more than one interpretation, it is ambiguous and can be easily misunderstood. Changes in the graphic display should be unambiguously related to the plant's state. The same graphic change should not be associated with more than one interpretation.