Description of User interface logic in use case modeling :
This article ventures into the gray area between user interfaces, system interfaces, and use case descriptions and also describes the requirements gathering through use case modeling. It discusses more about the theory behind the method, and also widens your modeling vocabulary to an extent. This article also focuses on the role of perspective in use case modeling. Also it teaches how perspective can be made to work for you. It can also work against you if improperly applied.