" The impedance mismatch between these two worlds, that of events, and that of objects, is something that's been recognized for a long time. Getting these two worlds to cooperate requires a lot of 'glue code' to make them work together . The 'model-view-controller' paradigm introduces the controller object in between the view (the GUI class) and the model (the object) to communicate between the other two objects. The actual implementation of the controller object can vary quite a bit, but the idea of an object to 'transform' events to changes in data and execution of methods is the essence of this pattern. What does "event driven" mean? Was there ever an application which did not respond to user events. . ? Just because an application responds to events does not mean it is "event driven". Admiralty Model Ship Event driven means it spends much of its time waiting for an event and then takes action if and when an event occurs. Contrast this with some programs that do not respond to events at all, but simply do their job and terminate. "

" III. The original of a model may itself be physical or conceptual. It may be so, independently of the consistency of the model. The model in the arts for example can be understood as an individual that functions as a proxy for certain aspects of a concept such as man, men, woman, child, etc. or as one of these under particular conditions. The original temporally or causally may be a predecessor of the original or a successor of it depending on the case at hand. Often it will be such that historically there can be found an iteration of sequences of model constitution and original constitution. Bad Model Ship One should not miss out the point that the original as well must be constituted in some way so it becomes accessible to the modeling individual I. IV. "