On June 9-10, 2011, a workshop at CERN will "explore the requirements for federated identity management across the different disciplines, compare the functionality, operational constraints and state of deployment of current technologies, and formulate a roadmap for how we could establish such a service in the future." The workshop will include presentations from CILogon, OSG, WLCG, DEISA/PRACE, IGTF, and others. Remote participation will be supported by EVO.