Ready or not, English is now the global language of business. More and more multinational companies are mandating English as the common corporate language—Airbus, Daimler-Chrysler, Fast Retailing, Nokia, Renault, Samsung, SAP, Technicolor, and Microsoft in Beijing, to name a few—in an attempt to facilitate communication and performance across geographically diverse functions and business endeavors.

A version of this article appeared in the May 2012 issue of Harvard Business Review.