A November, 2009 revision to DOL's "Prevailing Wage Determination Policy Guidance for Nonagricultural Immigration Programs," provides field guidance to the National Prevailing Wage Center (NPWC) on making centralized national prevailing wage determinations. This guidance supersedes DOL's March, 2005 guidance on prevailing wage determination policy, which had been directed to State Workforce Agencies (SWAs). The NPWC began handling all requests for prevailing wage determinations effective January 1, 2010.