People making use of a thing. Any person, organization or system which uses a service provided by others is a user.
(2002) S. Holmlid, Adapting Users: Towards a Theory of Use Quality, Linkoping Studies in Science and Technology Dissertation N° 765, Linkopings Universitet, Sweden.
(2006) E.B.-N. Sanders, "Design Serving People" in E. Salmi, L. Anusionwu, Cumulus Working Papers, Univesity of Art and Design, Helsinki.