One Sentence summary of the purpose of the UML Model:

1. Use Cases - "How will our system interact with the outside world?"
2. Class Diagram - "What objects do we need? How will they be related?"
3. Collaboration Diagram - "How will the object interact?"
4. Sequence Diagram - "How will the objects interact?"
5. State Diagram - "What stats should our objects be in?"
6. Package Diagram -"Show are we going to modularise our development?"
7. Component Diagram -"How will our software components be related?"
8. Deployment Diagram -"How will the software be deployed?"