Assessing Cognitive Workload Metrics for Evaluating Telecommunication Tasks

Telecommunication technology provides the potential for teamwork across distances. In this way, geographically separated team members can communicate electronically to solve problems. An experiment was conducted to test the sensitivity of three cognitive workload metrics to tasks performed under conditions of telecommunication vs. face-to-face communication. Twenty-three teams participated as subjects. A block puzzle pattern task was tested at four levels of puzzle difficulty under the two communication conditions. Task performance (time to complete and errors), as well as cognitive workload ratings were measured. Three workload metrics [Subjective Workload Assessment Technique (SWAT), NASA-TLX, and Modified Cooper Harper (MCH)] were compared. Each person's spatial ability was assessed using the Cognitive Laterality Battery. Both performance and workload varied as a function of puzzle difficulty. While all workload metrics were able to discriminate amongst some of the puzzle difficulty levels, SWAT had the two advantages of providing the most sensitive measure of difficulty plus a wider range of workload ratings.