Question $3$

Consider the case study that follows and answer subsequent questions.

The system stores information about two things: cars and owners. A car has attributes

for make, model, and year. The owner has attributes for name and address. Assume

that a car must be owned by one owner and an owner can own many cars, but an owner

might not own any cars $($perhaps he$/$ she just sold them all, but you still want a record of

his$/$ her in the system$).$

$3\mathrm{.}1$ Draw an entity$-$relationship diagram, including minimum and maximum cardinality.

$3\mathrm{.}2$ Draw a class diagram for the cars and owners described above, but include

subclasses for minibus, sedan, and minivan.

Question $4$

Consider the case study that follows and use it to answer question $4\mathrm{.}1$

The system for managing listings in a real estate company cited in question $1$ is used by

the real estate agents and managers on the daily basis. To be able to do any job with the

system, any user must first have their credentials verified by the system. An agent can

create a listing and then retrieve it later when needed. Some agents can update listings

as well. A listing update becomes complete only after a manager approves it$.$ Managers

can get listing reports from the system. They can also remove a listing to an archive file

or$,$ when the company ceases to market a property, to a trash can $($deletion$).$

$4\mathrm{.}1$ Based on this description, draw a use case diagram.