Correlations among NASA-TLX Scores

－Are Paired Comparisons Necessary?－

Abstract

Correlations among weighted workload （WWL） scores, simple average of six subscales （RTLX: Raw TLX） and adaptive weighted workload （AWWL） scores and, between weights and subscales （order） were investigated when each score was obtained after several tasks. In experiment 1, three levels of task difficulties were set in multi-attribute task battery. Six tasks （self-paced and machine-paced （twice） mental arithmetic tasks, Raven progressive matrix test, embedded figures test, mirror tracing task） were administered in experiment 2. Results indicate that significantly high correlation coefficients were obtained （Exp.1: WWL-RTLX .84，R-TLX-AWWL .96，WWL-AWWL .88．Exp.2: RTLX-WWL .95，RTLX-AWWL .98，WWL-AWWL .96）. Correlation coefficients between weights and subscales were .73 （ns） in Exp.1 and .83 （p＜0.05） in Exp.2. As shown in other reports, the utility of RTLX and AWWL which do not need paired comparisons is suggested. Furthermore, AWWL may be more sensitive than RTLX.