The eduGAIN service is intended to enable the trustworthy exchange of information related to identity, authentication and authorisation between the GÉANT (GN3) Partners' federations. The eduGAIN service will deliver this through co-ordinating elements of the federations' technical infrastructure and a policy framework controlling the exchange of this information.  The initial goal is to enable Pan-European Web Single Sign On (Web SSO) to both GÉANT services and to those provided by other communities represented by, or associated with, the GN3 Partners.