Use case 2: View Recommended Offers

Rational

Main flow	Question: what class ...	Answer	Justification
1. The renter requests personalized offers.	... interacts with the user?	ViewRecommendedOffersUI	Pure Fabrication.
	... coordinates the use case?	ViewRecommendedOffersController	Controller.
2. The system calculates offers based on the renter's preferences.	... knows the logged in renter?	CurrentSession
	... knows the renter's preferences?	Renter	Information Expert: Renter knows its own information.
	... calculates the offers?	OffersManager	Information Expert: OffersManager aggregates all Offers.
	... knows the OffersManager	Company	High Coesion + Low Coupling and Information Expert.
3.The system shows the offers to the renter.

Systematization

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

• Renter
• Company

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

• ViewRecommendedOffersUI
• ViewRecommendedOffersController
• CurrentSession
• OffersManager

Sequece diagram

Class diagram