Use case 10: View all contracts

Rational

Main flow	Question: what class ...	Answer	Justification
1. The company requests to see the contract history.	... interacts with the user?	ViewContractsPageUI	Pure Fabrication.
	... coordinates the use case?	ViewContractsPageController	Controller.
2. The company requests to sort the contract history.	... knows the contracts?	ContractManager	Information Expert: the manager knows its data.
	... sorts the contract history?	ViewContractsPageController	Controller.
3. The system shows the contract history.

Systematization

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

• Company
• Contract

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

• ViewContractsPageUI
• ViewContractsPageController
• ContractManager
• RentalContract
• TransferContract

Sequece diagram

Class diagram