The Model-View-Controller design pattern separates data access, business logic, data display, and user interaction. It also separates data display from user interaction. Discuss or contribute this explanation.

What does the weak entity type actually mean? What's the secret? Give an instance What does alternative specialization mean?How am I shown on the ER diagram? Give an example and create a diagram to match it.

What are main building blocks (elements) that you use to create a model using Systems Dynamics approach (e.g. in Simile software)? Describe what those elements represent in real systems and from mathematical perspective.

The Model-View-Controller paradigm separates the concerns of data access, business logic, data display, and user interaction. In addition, it clearly delineates information display from user participation. Give your input or discuss this rationale.