Table 4.

HEART calculations of AHEP—label design assessed as the EPC 6

Generic task type = G Nominal human error probability = 0.002
EPC	HEART effect multiplier	The assessed proportion of impact	Assessed EPC effect
2. A shortage of time available for error detection & correction	11	0.9	((11–1) × 0.9) + 1 = 10
17. Little or no independent checking or testing of output	3	0.86	((3–1) × 0.86) + 1 = 2.7
39. Distraction/Task Interruption	4	0.9	((4–1) × 0.9) + 1 = 3.7
6. A mismatch between an operator’s model of the world and that of a designer	8	0.8 (LA label) 0.22 (HCD label)	((8–1) × 0.8) + 1 = 6.6 ((8–1) × 0.23) + 1 = 2.5
Total assessed EPC effect	LA label	= (10 × 2.7 x × 3.7 × 6.6) = 664.22
	HCD label	= (10 × 2.7 × 3.7 × 2.5) = 255.63
Assessed human error probability	LA label = (0.002) × 664.22 = 1.33* HCD label = (0.002) × 255.63 = 0.51