The continuing mission of a prominent mining corporation in South Africa has been to advance its reputation as an industry leader in safety. This philosophy encouraged the management of one of its iron mines to be an early adopter of PRISM fatigue management, as part of their own aim in becoming one of the world’s safest mine operations. Managing fatigue was at the top of management’s list, given the mine’s 24-hour operations. Day and night shifts were each twelve hours, occurring in blocks of three or four consecutive days. Given the spreading awareness that shift work itself, in any industry, contributes to higher incidence of fatigue and consequent safety risk, the management understood that an effective method for mitigating this risk was needed— especially given that fatig

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