Every electronic display device will degrade. When has it degraded to the point of not being acceptable? The traditional approach to display performance evaluation is to view a test pattern, in which results depend upon the knowledge and skill of the viewer. The alternative is to undergo rigorous laboratory analysis with very expensive measuring equipment. There is a need for a quick and easy means to confirm that display performance is suitable for the task at hand without the unknowns and variations in visual interpretation. Video Instruments has developed this capability. Now that displays are computer compatible, it is simple to insert test stimuli in software form, providing a reference image without having to disconnect equipment and place it on a laboratory bench. A variety of test patterns can be presented, but there remains the question of interpretation. Video Instruments has solved this problem by providing carefully crafted symbology to be interpreted. The viewer then enters into the computer what that symbology is, confirming that the computer based system is operating properly, that through transmission and display a suitable image is being presented, that viewing conditions are acceptable, and that the viewer has the abiity to discern critical information.