In computer science, the role class model is a role analysis pattern[1] described (but not invented [2]) by Francis G. Mossé in his article on Modelling Roles.[3] The role class pattern provides the ability for a class to play multiple roles and to embed the role characteristic in a dedicated class.
In our society, as we built it, roles are everywhere. Anyone trying to work in a team to create something has a role. In cinematography, many different persons take part in the creation of a film: the film director, the producer, actors, play writer(s), etc.
Even our State organisations are based on various roles. In a Republic, you have a President, Ministers, Deputies, etc.
Dealing with these situations is one of the problems encountered most during object-oriented analysis. Francis G. Mossé has identified 5 role analysis patterns that can be used to solve most role related problems: Role Inheritance, Association Roles, Role Classes, Generalised Role Classes and Association Class Roles. They all have various degrees of constraints, flexibility or power, which together offer a complete solution to most role-related problems.
^Fowler, Martin (1997-07-20). "Dealing with Roles" (PDF). Analysis Pattern. Retrieved 2007-01-16.
^There are a citation about it in the book Business Modeling With UML: Business Patterns at Work by Magnus Penker (Author), Hans-Erik Eriksson chapter:
...Its origin is unknown, but this pattern has been invoked to model mine-clearance systems used by the United Nations. A description of the concepts underlying this pattern can be found in Murray R. Cantor's book, Object-Oriented Project Management with UML (John Wiley & Sons, Inc., 1998).
^Francis G. Mossé (September 2002). "Modeling Roles - A Practical Series of Analysis Patterns". Journal of Object Technology, vol. 1, no. 4. pp. 27–37. Retrieved 2006-12-28.
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