Use case 3: Rent Vehicle

Rational

Main flow	Question: what class ...	Answer	Justification
1. The user chooses to rent a vehicle.	... interacts with the user?	RentVehicleUI	Pure Fabrication.
	... coordinates the use case?	RentVehicleController	Controller.
2. The system shows the information of the vehicle (i.e. specs, price and available schedule).	... knows the vehicle's information?	Offer	Information Expert: the Offer knows all the information of the vehicle
	... knows the vehicle specs?	Vehicle	Information Expert: Vehicle knows its own information
3. The system requests a schedule, i.e., start and finish time.
4. The renter inserts the schedule.	... validates the schedule internally?	Schedule	Information Expert.
	... validates the schedule globally?	Offer	Information Expert: The Offer knows the available schedules.
	... creates the rental?	RentalManager	Creator: RentalManager aggregates all Rentals.
	... calculates the price?	Rental	Information Expert: Rentals knows all the important information to calculate the price.
5. The system shows all the information to the renter, requesting confirmation
6. The renter confirms.	... saves the Rental?	RentalManager	Information Expert: RentalManager aggregates all Rentals.
7. The system informs about the success of the operation

Systematization

From the rational results that the conceptual classes promoted to software classes are:

• Rental
• Offer
• Vehicle
• Schedule
• Company

Other identified software classes (e.g. Pure Fabrication):

• RentVehicleUI
• RentVehicleController
• RentalManager

Sequece diagram

Class diagram