Accession Number : ADA198148

Title :   Optimizing Control-Display Interfaces: An Evaluation of Display/Control Gain.

Descriptive Note : Interim rept.,

Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF INDUSTRIAL ENGIN EERING AND OPERATIONS RESEARCH

Personal Author(s) : Arnaut, L Y ; Greenstein, J S

PDF Url : ADA198148

Report Date : Jan 1988

Pagination or Media Count : 205

Abstract : Display/control gain is the amount of movement that occurs on a display in response to a unit amount of movement on the control. Two studies were conducted to determine the adequacy of identifying the optimum gain for an interface as a method of control display interface optimization. The first study examined the effects of changes in both the maximum control input and the display width on target acquisition performance with a touch tablet and a trackball. The hypothesis that an interaction between the control input and the display output would determine performance was not supported for either device. There was a main effect of the control input for the touch tablet, and significant effects of the control input and the display width for the trackball. The results also indicate that, at least for the touch tablet, gain is not a sufficient specification for performance. The second study evaluated the effects of changes in the display amplitude, the display target width, and the control amplitude. There were significant interactions among these three factors for both touch tablet and trackball target acquisition performance. These results extend the findings of the first study with respect to the inability of gain to predict performance. In addition, the inadequacy of Fitts' Law as it applies to the given interfaces is discussed. (SDW).

Descriptors :   *CONTROL SYSTEMS, *DISPLAY SYSTEMS, *INTERFACES, AMPLITUDE, GAIN, HYPOTHESES, INPUT, OPTIMIZATION, OUTPUT, TABLETS(CHEMICAL), TARGET ACQUISITION, TARGETS, TOUCH, WIDTH, AMPLITUDE, CONTROL, DISPLAY SYSTEMS, GAIN, HYPOTHESES, INPUT, INTERFACES, OPTIMIZATION, OUTPUT, TABLETS(CHEMICAL), TARGET ACQUISITION, TARGETS, TOUCH, WIDTH

Subject Categories : Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE