Users, Roles, and Personas
http://www.foruse.com/articles/rolespersonas.pdf

Constantine, Larry L.
Constantine and Lockwood
2006

Abstract:

User role models are compared in detail with the popular user modeling technique of personas. User roles offer a more compact, more focused means of capturing and exploring those aspects of users most relevant to interaction design. The advantages and limitations of the approaches are considered and a combined strategy is described.