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A six-month trial of a four-day workweek kicked off in the UK this week, the biggest pilot to take place so far. More than 3,000 employees from 70 companies will work one less day for the same pay. Organized by the UK-based research group Autonomy and its partners, analysts will track productivity and employee well-being during the pilot.

similar trial conducted in Iceland from 2015 to 2019 found an increase in overall well-being while productivity remained the same; 86% of workers in Iceland are now on or transitioning to a four-day schedule. Other countries plan to test the schedule this year, including Scotland, Australia, New Zealand, and Spain.

In the US and Canada, 38 companies will participate in a similar pilot. The potential shift faces challenges to widespread adoption—a survey of 459 companies found 91% were not considering a shortened workweek.

See the history of the concept here.