Higher Productivity at 80% Effort.

HBR - October 2009

Making Time-Off Predictable -- And Required
by Leslie A. Perlow and Jessica L. Porter

"Professional services firms typically have a 24/7 on-call culture. But one management consulting company [The Boston Consulting Group] is getting better results by experimenting with downtime—even in this economy."

http://hbr.harvardbusiness.org/2009/10/making-time-off-predictable-and-required/ar/1