An Ambassador User ensuring needs of the user communities are met
Have somebody act as an Ambassador User, ensuring needs of the various direct user communities are met
I donít know the origin of the concept, but came across it in Ref 1.
The champion wants his or her constituent groupís real needs to be met, and might not understand the needs of other groups of users.† There may be multiple Product Champions, these people may normally act in a variety of other roles.† The champion may or may not have authority to sign off on requirements.† See also PatronRole where the needs of the project are championed, and CustomerInterface, where this role may be extended by taking on related responsibilities.
1. Ellen Gottesdienerís page for articles on JAD and related topics, see IEEE paper on Requirements by Collaboration