The dilemma is about which visual cue to employ in the screen design.

There are several parameters to examine:

• Primary visual cues are about the location, size and shape of screen and panel objects
• Secondary visual cues are about the object images, colors and texture.

Guidelines

• Primary visual cues should be distinctive for hazard detection and uniform in all other situations.
• Secondary visual cues should be distinctive in normal operation and uniform in all other situations.

Updated on 20 Jul 2016.