Many enterprises have already adopted Software as a Service (SaaS) for non-critical applications-more than three-quarters of U.S. organizations by the end of 2009, according to IDC. Now some are beginning to examine the case for introducing SaaS for core business applications, such as accounting and enterprise resource planning (ERP) systems. Research by Saugatuck Technology with members of the Financial Executives International (FEI) found that SaaS adoption for core financial accounting will rise from 15% of all enterprises in 2008 to 22% in 2010 and 27%-more than one in four-shortly thereafter.