Proceedings of the Human Factors Society Annual Meeting (27th) on the Effect of Delayed Report on Subjective Ratings of Mental Workloads, Held at Norkfolk, VA on 10-14 October 1983.

Abstract : Forty-eight subjects performed a short-term memory task with several difficulty levels and provided either immediate or delayed ratings of workload via the Subjective Workload Assessment technique (SWAT) . Mean SWAT ratings did not vary significantly as a function of delayad report, but a substantial number of subjects gave delayed ratings that were discrepant from their immediate ratings. A counterbalancing effect in delayed ratings appears to have been a factor in the failure of the delay effect to reach significance. A secondary objective of this study was to examine the sensitivity of SWAT in a between-subjects design. SWAT ratings varied significantly as a function of task difficulty manipulations, supporting the sensitivity of SWAT to the workload of the conditions used.