Title page for ETD etd-51798-151154

Type of Document Master's Thesis
Author Thepvongs, Somchart
Author's Email Address sthepvon@vt.edu
URN etd-51798-151154
Title Use of Integrated Process Control Displays in Work System Design
Degree Master of Science
Department Industrial and Systems Engineering
Advisory Committee
Advisor Name Title
Kleiner, Brian M. Committee Chair
Sturges, Robert H. Committee Member
Williges, Robert C. Committee Member
  • mental workload
  • control charts
  • three-dimensional displays
  • Macroergonomics
  • signal detection theory
Date of Defense 1998-06-04
Availability unrestricted
Given the continuing deployment of total quality control and total quality

management initiatives by organizations, employees have seen changes in

their work environment. Furthermore, the impact of downsizing has

resulted in operators becoming responsible for the quality of their own

processes. This study tested the impact of various display alternatives

of control chart data on decision performance and mental workload. 

The control charts were shown as multiple two dimensional displays, a composite

two dimensional display, and a composite three dimensional perspective


Multiple two dimensional displays were found to have significantly higher

decision accuracy and decision confidence ratings than either composite

displays. No significant difference in decision accuracy and decision

confidence ratings was found among the composite displays. The type

of display did not have a significant effect on decision time. Mental

workload was also found to be significantly affected by the type of display

used. Multiple two dimensional displays imposed significantly lower

levels of mental workload than either composite display. No significant

difference in mental workload was found among the composite displays.

These results indicated that multiple two dimensional displays should be

used when control chart data from multiple processes must be displayed.

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