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	Skala za procenu performansi operatera (OPAS)	NASA indeks opterećenja zadatkom (NASA-TLX)
Oblast	Ljudski faktori	Ljudski faktori
Porodica	Process / pipeline	Process / pipeline
Godina nastanka	1993	1988
Tvorac	William W. Wierwille, Frank T. Eggemeier	Sandra G. Hart & Lowell E. Staveland
Tip	Observer-rated / Self-rated	Self-report
Temeljni izvor	Wierwille, W. W., & Eggemeier, F. T. (1993). Recommendations for mental workload measurement in a test and evaluation environment. Human Factors, 35(2), 263–281.	Hart, S. G., & Staveland, L. E. (1988). Development of NASA-TLX (Task Load Index): Results of empirical and theoretical research. In P. A. Hancock & N. Meshkati (Eds.), Human Mental Workload (pp. 139-183). Elsevier Science Publishers.
Drugi nazivi	OPAS, Performance Rating Scale	NASA-TLX, TLX
Srodne	4	4
Sažetak	The Operator Performance Assessment Scale (OPAS), formalized by Wierwille and Eggemeier in 1993, is a structured rating method for assessing operator task performance on multiple dimensions (primary task accuracy, secondary task accuracy, task completion time, error rate, procedure adherence) in applied settings. OPAS bridges subjective workload perception (NASA-TLX, situational awareness) and objective behavioral metrics by capturing expert judgment of performance quality across multiple performance channels, enabling holistic evaluation of how well operators managed task demands.	The NASA Task Load Index (NASA-TLX) is a multidimensional subjective workload assessment tool developed by Sandra Hart and Lowell Staveland at NASA's Ames Research Center in 1988. It measures six dimensions of cognitive and physical task load to quantify operator workload across diverse task domains, from aviation and process control to human-computer interaction. The TLX has become the gold standard for workload measurement in human factors research and applied settings.