In February 2011, the Society for Editors and Proofreaders (SfEP) published a report on overseas outsourcing of editorial work. The report is well worth reading and keeping handy. Unfortunately, the response to the Society’s questionnaire was small. From the report:
In 2010, the SfEP asked members to report their experiences of this type of editorial outsourcing. More than 40 replied, giving us perspectives from freelance project managers, proofreaders and in-house desk editors, as well as freelance copy-editors who have seen their supply of work dry up and their income dwindle. The relevant parts of their replies are quoted and commented on in this report.
The complete report can be found here: What Price Quality? Overseas Outsourcing of Editorial Services.