What key principle should be considered when implementing MVC architecture?

The key fundamental rule in implementing the MVC architecture is the clear separation of responsibilities between components:

• Model: Responsible for data and business logic. The Model should not be aware of the view or the controller.

• View: Responsible for displaying data to the user. The View should not contain business logic.

• Controller: Handles user input, interacts with the Model, and selects the View for display.

This separation ensures loose coupling of components, simplifies maintenance and testing of the code, and allows parts of the application to be developed and modified independently.