2. From the core features as a whole, draw a systems use case diagram identifying at least twelve (12) use cases with their corresponding functions and associated actors in the overall system, focusing only on the core features. Your twelve {12) use cases can be two (2) from each of the core feature or as you desire, but they must be relevant to the systems requirements as detailed in the SR5. 3. For each identified use case in your diagram, prepare a detailed use case specification providing full description of the use cases. 4. Describe how you would design the user interface for the system following the six (6) Principles of User Interface Design as discussed in class. You need to explain how you would apply each principle in your user interface design