Companies from Microsoft to Shake Shack have experimented with a shorter, 4-day workweek -- and most of the time it's worked really well (MSFT)

Oli Scarff / Getty Images Companies from Microsoft to Shake Shack have experimented with a four-day workweek to improve productivity and work-life balance. Some of these companies have said the shorter week has made it easier to focus on important tasks. Others, like educational coding startup Treehouse, found that it made it challenging to uphold a solid work ethic. Visit Business Insider's homepage for more stories. With the rise of popular work chat apps like Slack and easy access to corporat...