The Costs and Benefits of Telecommuting John G. Mabanglo/European Pressphoto Agency Yahoo is recalling its fleet to the mother ship: Everyone is now supposed to work at Yahoo offices, not offsite. Last week, Marissa Mayer, the chief executive of Yahoo, issued a new policy requiring all employees to report to work at Yahoo offices and not remotely. While the company is now distancing itself from the national debate it has stirred, the decision flies in the face of flexible work schedules that characterize many tech companies and is an affront to working parents trying to balance job demands with raising a family - an issue that rankles some because it comes from Mayer who is herself a new mom. What is lost or gained when workers telecommute? And how should companies decide whether and when to allow people to work remotely?