An interesting new pattern here (from the creator of MVC) is DCI: http://en.wikipedia.org/wiki/Data,_Context,_and_Interaction http://en.wikipedia.org/wiki/Data,

An interesting new pattern here (from the creator of MVC) is DCI: http://en.wikipedia.org/wiki/Data,_Context,_and_Interaction http://en.wikipedia.org/wiki/Data,_Context,_and_Interaction Essentially it's a way to move code where multiple objects collaborate to achieve something into its own separate class (Context). However when executing in a context, each involved object takes on a "Role" which grants its additional methods specific to this context.