Assume the following communication diagram is the only information you have about a currently paper-based university class management and enrollment system:

You are asked to digitize the system. Reverse engineer the system model by performing these
tasks:
1. Write the problem statement: Use your application domain knowledge to describe
the functional and nonfunctional requirements.
2. Identify the functional model: Identify actors and use cases and draw the use case
model.
3. Identify the object model: Draw the corresponding class diagram, add generic
associations, multiplicies and role names. Also identify inheritance and
aggregations.
4. Complete the dynamic model: Draw the corresponding sequence diagram, identify
additional actors, events and messages.