It is a truism(不言而喻的道理) that a tired worker is less productive than a fresh one. But researchers at Wharton and Kenan-Flagler business schools have shown that compliance (遵从) with routine tasks can fall away if a person is under great pressure.

　　Their study’s focus was hand hygiene, health care’s powerful weapon against cross-infection. Such is the importance of sanitization — when done thoroughly, it can reduce infection by the MRSA “superbug” by 95 per cent — that hospitals have started to monitor compliance, using electronic tags in sanitizers and workers’ badges. Each time a member of staff avoids the sanitizer, the omission is recorded.

　　The extraordinarily rich information from such a system is a treasure for big data researchers such as Wharton’s Katherine Milkman. Analysing 13.8 million “unique hand hygiene opportunities” for more than 4,000 staff at 35 hospitals, she and her co-authors found that over a 12-hour shift the average compliance of staff members fell by 8.5 percentage points. Lax hand washing, they suggested, could cost

　　＄25 bn annually in treatment of unnecessary infection in the US and lead to 70,000 needless deaths.

　　I think the new research adds a further point: if technology makes some vital tasks that used to be central seem routine, workers may also start to neglect them as the day drags on — with potentially bad consequences.

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