This document is for U-M information technology staff members. It (1) Provides brief background information about federated identity management, InCommon, Shibboleth and attributes; (2) Describes the procedure for requesting that U-M release attributes to a Shibboleth Service Provider (SP) to permit access to U-M users; (3) Provides detailed information about the attributes available to SPs; and (4) Details the general procedure for reviewing and approving attribute release.