There was a 65% reduction in sick days, and a 57% fall in the number of staff leaving participating companies, compared to the same period the previous year. Company revenue barely changed during the trial period -- even increasing marginally by 1.4% on average.
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Editor's note - Productivity does not depend on hard or how long you work but on how smart you work. The "work" often expands to the amount of time allocated and expected rather than outcomes and deliverables.