IDM-04: Login to a community’s user portal with an identity from another organization

Executive Summary: 
A community member needs to login to a community user portal using an identity from another organization because it’s easier than remembering a separate community username and password. (The other organization is most likely the community member’s home academic institution or employer.)
User Importance Summary: 
Access to resources and services in the public research computing community requires persistent identities for individuals. Individual users need to be able to authenticate (prove their identity) to the system, and it is helpful if they can use an existing identity (e.g., their campus login).
Target Communities and Sizes: 
Community members at InCommon and eduGAIN insitutions - 1,000 < N < 10,000