เปรียบเทียบวิธี

	Operator Performance Assessment Scale	Human Error Assessment and Reduction Technique
สาขาวิชา	ปัจจัยมนุษย์	ปัจจัยมนุษย์
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1993	1988
ผู้ริเริ่ม	William W. Wierwille, Frank T. Eggemeier	Jeremy C. Williams
ประเภท	Observer-rated / Self-rated	Expert-rated / Observational
แหล่งต้นตำรับ	Wierwille, W. W., & Eggemeier, F. T. (1993). Recommendations for mental workload measurement in a test and evaluation environment. Human Factors, 35(2), 263–281.	Williams, J. C. (1988). A data-based method for assessing and reducing human error to improve operational performance. In IEEE Fourth Conference on Human Factors and Power Plants (pp. 436-450). IEEE.
ชื่อเรียกอื่น	OPAS, Performance Rating Scale	HEART
ที่เกี่ยวข้อง	4	4
สรุป	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 Human Error Assessment and Reduction Technique (HEART), developed by Jeremy Williams in 1988 for the nuclear industry, is a structured method for assessing the probability of human error in safety-critical tasks and identifying error reduction strategies. Unlike scales that measure subjective experience (workload, situational awareness), HEART is an analytical tool combining expert judgment, task analysis, and empirical error rates to quantify task-specific error probability and guide human factors interventions in high-stakes operations.