The Eva framework uses three classes; Events. Views and Models. Events describe actions. Views present a model's data graphically and handle high level user interaction with the model. Models are data, typically part of the application.
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MCAFFER, Jeff and THOMAS, Dave, 1987. Eva: An Event Driven Framework for Building User Interfaces in Smalltalk. Online. 1987. Available from: https://cms.scs.carleton.ca/sites/default/files/tr/tr-129.pdf