Scenario: Choosing to reserve a book
Given I have navigated to the book details page
When I tap the "Reserve" button
Then a window asking for extra information appears
Scenario: Request a book reservation
Given I tapped the "Reserve" button, in the book details page
When I insert the information needed
And I tap the "Request Reservation" button
Then the reservation request is done
User interface mockups
Acceptance tests
Value and effort