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+1. Interaction Diagram for each system operation
+2. Design class diagram showing all relevant classes
+3. Prepare walkthrough for class diagram
+
+Notes:
+Do not forget the start-up system operation that creates and initializes objects for other system operations to work with.
+Also make sure to show creating and logging the information being processed by your system operations.
+
+System Operations:
+- Start Up
+- Shut Down
+- Print Subscriber List
+- Calculate Bills
+- Add Subscriber
+- Modify Subscriber
+- Delete Subscriber
+- Add Delivery Person
+- Modify Delivery Person
+- Delete Delivery Person
+
+Classes:
+- Subscriber
+- Subscription
+- DeliveryPerson
+- DeliveryArea
+- SubscriptionRate (RegularRate, SpecialRate)
+- System
+- Database