Wearables at Work - A Nudge to Improve Productivity?

Many businesses are giving their employees wearable devices as a way of nudging workers to become more active and ultimately lower the cost of absenteeism and raise productivity. But how much of our personal information if any should we will be willing to share with employers? David Grossman reports for Newsnight. Teachers of a certain vintage will remember using 'time and motion' studies as examples of monitoring employees - technology has moved on from the stopwatch and clipboard but the motives seem eerily familiar.