1. It's for clearer code and more easily extensiblity.
2. Three parts: one represents the business information, one the visual representation and one the control mapping between the view and business information.
3. Applicability by characteristics:
The internal representation for the system may be completely different from the representation on a screen.
On the same component, different sources may invoke different behavior.
Behavior or representation changes as the component is used.
Reuse, reuse

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